Common as these Stylonychke are, and abundant beyond all calculation, where they do occur, from their tendency to self-division, they are not so universally met with as their cousins, of the genus Euplotes. These are still more highly organised, and will please you by their activity and sprightly intelligence, I am sure. Here are several individuals in the live-box at this moment.

They differ from the Stylonychice, in having the soft body covered with a plate of crystal mail, hard and inflexible, much like the shield of a Tortoise. Several species have this glassy shield marked with delicate lines running lengthwise ; sometimes in the form of parallel ridges, as in a little species found in infusions (perhaps E. charon), at others forming rows of minute round knobs, as E. truncatus, the species now before us. The shield is ample, considerably overlapping the soft body ; it rises into an arched form in the centre ; and is more or less round or oval. The mouth is oblique, and extends a long way clown the under surface ; it is set with strong and fine cilia, which also EUPLOTES. spread over the front. The orgai, r of motion are, as before, long styles, pointed and rather stiff processes, which project from beneath the shell backwards and downwards, and soft hook-like uncini, which are set chiefly near the fore part of the inferior surface. In the species before us these are about six or seven in number, but in E. charon they are more numerous. The twinkling rapidity with which these little feet are applied to the

surface in crawling affords a pleasing siglit : particularly when the animal is running back-downwards on the upper glass plate of the live-box. Some species have bristles (or setcp) affixed to the hinder part of the shell, from which they diverge. In E. truncatus these are four ; but they are wanting in E. charon. The body displays a mass of granules, vacuoles, and vesicles of different sizes.

These are very beautiful objects ; and their sprightly motions and apparent intelligence give them an additional interest. They crawl more than they swim, running with great swiftness hither and thither, frequently taking short start?, and suddenly stopping. The specimens which we are examining are taken from wTater which had been kept in a jar for several weeks. The vegetable matters are decaying; and among the stems and filaments this pretty species crawls and dodges about. It seems reluctant to leave the shelter of the decaying solution; sometimes one will creep out a little way into the open water, but in an instant it darts back, and settles in among the stems and flocculent matter. Any attempt by turning the glass cover to bring it out into view only makes it dive deeper into the mass, as if seeking concealment. This is about TT—y of an inch in length of lorica ; and the E. charon is not more than one-fourth of this size. These creatures remind one of an Oniscits, especially when in profile.

There is an animal very closely allied to these, but much more beautiful, being of a clear greenish translucency, with several vesicles filled with a rose-coloured or purple flu.d of much brilliancy. This creature, which bears the name of Chlamidodon, has the peculiarity of a set of wand-like teeth arranged in a hollow cylinder.

And with these we dismiss the Infusoria, a class of animals which, from their minuteness, the number and variety of their species, their exceeding abundance, the readiness with which they may be procured, and, as it were, made to our hand (by simply steeping vegetable 2 E matter in water), and the uncertainty which still prevails concerning many parts of their structure and economy ; and therefore, concerning their true affinities in the great plan of creation,—offer one of the most promising fields of research which a young microscopist could cultivate.

These are Thy glorious works, Parent of good, Almighty ; Thine this universal frame, Thus wondrous fair. Thyself how wondrous then ! Unspeakable, Who sitt'st above these heav'ns, To us invisible, or dimly seen In these Tliy loicest works; yet these declare Thy goodness beyond thought, and power divine.

THE END.

Index

Acineta, 407.
Acontia, 356.
Air-tubes of Fly, 95.
Alcyonium, 349.
Alternation of Generations, 324, 333.
Amœba, 378.
Anchors of Synapta, 299.
Animalcules, 389.
Antennæ of Chafer, 162; Crab, 171; Fly, 166; Gnat, 166; Insects, 158; Moths, 163; Skipjack, 163; Weevil, 160.
Aphrodite, 263.
Arcella, 383.
Barnacles, 192; hand of, 192; transformations of, 195.
Bee, eyes of, 170; foot of, 119; mouth of, 142; sting of, 125; wing of, 73.
Beetle, mouth of, 138.
“Bird’s-head,” 64; use of, 68.
Blood of Beasts, 27; Birds, 28; Fishes, 28; Frog, 29; Man, 27; Reptiles, 28; Tunicata, 33.
Brachionus, 225.
Bristle-tail, scales of, 77.
Bug, mouth of, 143.
Bugula, 64.
Butterfly, scales of, 79, 80; sucker of, 153.
Caryophyllia, weapons of, 364.
Chameleon-fly, 101.
Cheese-mite, 220.
Chilomonas, 401.
Chirodota, 298.
Cicada, drum of, 89; ovipositor of, 136.
Cilia of Cydippe, 310; Infusoria, 397, 403, 409; Rotifera, 223, 252.
Cinclides, 358.
Cnidæ, 342, 356.
Cockchafer, antennæ of, 162; spiracle of, 100.
Coleps, 399.
Contractile Bladder, 250, 380, 397.
Corkscrew Coralline, 63.
Corynactis, weapons of, 369.
Cothurnia, 409.
Cow’s paps, 349.
Crabs, 171; ears of, 172; eyes of, 174; stages of, 182.
Crane-fly, spiracle of, 99.
Craspeda, 364.
Cricket, drum of, 85.
Cuckoo-fly, ovipositor of, 128.
Cuttle-shell, 39.
Cyclops, 175.
Cydippe, 308.
Cypris, 180.
Daphnia, 178.
Dead-men’s fingers, 349.
Diamond-beetle, scales of, 83.
Dragon-fly, 71; eye of, 166.
Dumb-bells of Holothuria, 297.
Dyticus, foot of, 117.
Earthworm, 259.
Ecthoreum, 366.
Egger-moth, 163.
Euglena, 389.
Eunice, 268.
Euplotes, 416.
Eyes of Crab, 174; Dragon-fly, 166; Harvestman, 209; Infusoria, 389; Insects, 166; Rotifera, 236, 389; Scallop, 50; Snail, 54; Spider, 207.
Feathers, structure of, 15.
Fission of Infusoria, 394, 405.
Flea, mouth of, 146.
Fly, antennæ of, 166; flight of, 70; foot of, 115; spiracle of, 98; tongue of, 151; wing of, 72.
Foot of Actinurus, 249; Bee, 119; Beetle, 117; Brachion, 227; Dinocharis, 241; Fly, 109; Silkworm, 123; Spider, 217; Whiptail, 239.
Foraminifera, 383.
Frog, blood of, 31.
Froghopper, ovipositor of, 135.
Galathea, 186.
Gall-fly, egg-tube of, 128.
Gnat, antennæ of, 166; grub of, 103; mouth of, 149; wing of, 74.
Grantia, 386, 388.
Grasshopper, sounds of, 86.
Hair of Bat, 12; Bee, 14; Beetle, 14; Cat, 8; Hog, 5; Horse, 7; Man, 2; Mole, 9; Moth, 14; Mouse, 11; Sable, 9; Sheep, 7.
Halichondria, 385.
Harvestman, 209.
Heart-urchin, 292.
Horse-fly, mouth of, 145.
House-fly, 70.
Humble-bee, 71.
Hydractinia, 334.
Infusoria, 389.
Insects, 70; air-tubes of, 93; antennæ of, 158; eyes of, 166; feet of, 109; mouths of, 138; sounds of, 84; stings, &c., of, 125.
Jelly-fish, 307.
Katedid, 86.
Laomedea, 326; medusoids of, 331.
Lares, 345.
Larva of Urchin, 301.
Leech, 269.
Limpet, tongue of, 46.
Locomotion, variety in, 258.
Lombrinereis, 268.
Luminosity of Medusa, 319.
Lynceus, 177.
Madrepore, weapons of, 364.
Mastax, 233.
Medusæ, 307; transformations of, 333.
Medusoids of Laomedea, 331; Stauridia, 343.
Megalopa, 182.
Mite, cheese, 220; water, 222.
Mollusca, ears of, 55; eyes of, 51; shells of, 39; tentacles of, 50; tongues of, 46.
Moths, antennæ of, 163.
Moths, scales of, 79, 81.
Mouth of Bee, 142; Beetle, 138; Brachion, 230; Bug, 143; Flea, 146; Gnat, 148; House-fly, 151; Sea-worm, 267; Sword-bearer, 246; Tube-wheel, 251; Whiptail, 238.
Murder, discovery of, 25.
Nacre, 43.
Nais, 262.
Nucleus of Infusoria, 406.
Nymphon, 218.
Otolithes of Medusæ, 320; Slug, 56.
Ovipositor of Cuckoo-fly, 128; Gall-fly, 128; Saw-fly, 131.
Paramœcium, 396.
Pearls, 44.
Pedicellariæ, 282; structure of, 282; use of, 288.
Periwinkle, eating of, 49; tongue of, 50.
Perophora, circulation in, 34; respiration in, 36.
Phyllodoce, 266.
Pleasures of Sea-shore, 325.
Podura, scales of, 78.
Polymorphina, 383.
Polynöe, 262.
Polypes of Alcyonium, 350; Hydractinia, 334; Laomedea, 326; Lar, 348.
Polystomella, 383.
Polyzoa, 60.
Proteus, 378.
Protozoa, 376.
Pseudopodia, 384.
Robber, story of, 2.
Rotifera, 223.
Sabella, 343.
Sagartia, 356, 366.
Sarsia, 313.
Saw-fly, ovipositor of, 130.
Scales of Butterflies, 79; Bristle-tail, 77; Diamond-beetle, 83; Flounder, 21; Gnat, 75; Gold-fish, 19, 24; Perch, 17; Pike, 23; Podura, 78; Sugar-louse, 77; Wrasse, 21.
Scallop, eyes of, 50.
Sea-anemones, weapons of, 315.
Sea-cucumber, 296; dumb-bells of, 297.
Sea-mat, 59.
Sea-mouse, bristles of, 264.
Sea-shore, pleasures of, 325.
Sea-urchin, spines of, 277; larva, 301; pedicellariæ, 282; pores, 290; skeleton, 302; suckers, 305.
Serpula, 271.
Shell of Cuttle, 39; Pearl-oyster, 42; Pinna, 42.
Shore-crab, 182.
Silkworm, foot of, 123; spinner of, 157.
Skeleton Wheel-bearer, 241.
Slug, ears of, 55; tongue of, 46.
Snail, eye of, 54.
Spicula of Alcyonium, 352; Chirodota, 299; Fish-scales, 24; Holothuria, 298; Sponges, 385; Synapta, 299.
Spiders, eyes of, 207; fangs of, 205; foot of, 217; habits of, 210; silk of, 211; spinner of, 213.
Spines of Heart-urchin, 292; Sea-urchin, 277.
Spinner of Silkworm, 157; Spider, 213.
Spiracles of Insects, 97, 106.
Sponges, spicula of, 386.
Stauridia, 340.
Sting of Bee, 125.
Stylonychia, 411.
Suckers of Sea-cucumber, 296; Sea-urchin, 288.
Sugar-louse, 77.
Swan-neck, 393.
Sword-bearer, 246.
Synapta, 299.
Tentacle of Cydippe, 309; Hydractinia, 339; Laomedea, 329; Scallop, 50; Thaumantias, 319.
Thaumantias, 319.
Tongue of Butterfly, 154; Fly, 151; Limpet, 46; Periwinkle, 46; Slug, 46; Trochus, 47.
Trachelocerca, 393.
Transformations of Barnacle, 195; Crab, 182; Galathea, 188; Medusa, 323; Polype, 324; Sea-urchin, 301; Tube-wheel, 256; Vorticella, 408.
Tripod Wheel-bearer, 248.
Trochus, tongue of, 47.
Tube-wheel, 251.
Turris, 321.
Urchin, Sea, 276.
Vacuoles, 381.
Vaginicola, 410.
Vorticella, 402.
Water-fleas, 175.
Weapons of Anemones, 355; Corynactis, 369; Madrepore, 364; Sea-worms, 262.
Weevil, 160; Scales of, 83.
Wheel-bearers, 223.
Wheels of Brachionus, 226; Chirodota, 298.
Whiptail, 238.
Wing of Bee, 73; Fly, 72, 84; Gnat, 74.
Wool, 13.
Worms, 258.
Zoea of Crab, 181.
Zoophytes, 325.

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