The same sea urchin, with and without its armour

Acrocladia mamillata with its spines: the book’s Fig. 111 gives the animal a bristling outline. The patterned shell underneath is easier to recognise in the next view.

Fig. 112 shows the same named species after death, with its spines removed. What looked like a prickly mass becomes a shell with regularly arranged plates and raised points.

Plate VIII places sea urchins in rocky hollows. Its caption says they occupy excavations they have made. Here the isolated specimen becomes part of the book’s pictured seashore.

The same sea urchin can look like two different objects. Compare the book’s paired spiny and bare specimens, then its rocky habitat plate. The Ocean World (1872), physical PDF pages 286–289. Colour remastered by Pandi.

Acrocladia mamillata with its spines: the book’s Fig. 111 gives the animal a bristling outline. The patterned shell underneath is easier to recognise in the next view.
https://askpandipro.s3.amazonaws.com/users/1/documents/11029/figures/118.png?AWSAccessKeyId=AKIAQT4QH3CHNPX5WHX7&Signature=TUqChObq4BV%2FIwfCsfINXVWnKIM%3D&Expires=1791479719
Fig. 112 shows the same named species after death, with its spines removed. What looked like a prickly mass becomes a shell with regularly arranged plates and raised points.
https://askpandipro.s3.amazonaws.com/users/1/documents/11029/figures/119.png?AWSAccessKeyId=AKIAQT4QH3CHNPX5WHX7&Signature=l1FBtDL7I%2BiwQIw4mN2TX3ZyJYs%3D&Expires=1791479719
Plate VIII places sea urchins in rocky hollows. Its caption says they occupy excavations they have made. Here the isolated specimen becomes part of the book’s pictured seashore.
https://askpandipro.s3.amazonaws.com/users/1/documents/11029/figures/117.png?AWSAccessKeyId=AKIAQT4QH3CHNPX5WHX7&Signature=Qp%2FrTslPyR%2BdCtGSn6Z61ylxw3I%3D&Expires=1791479719

The same sea urchin, with and without its armour

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