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Arthraster cristatus (Spencer)

 

This exceptionally rare form of Arthraster from the White Chalk is distinguished from Arthraster dixoni by the crater-like pits on the central ridges of the ossicles.

 

A B

1).  Type specimen; reconstructed arm portion, viewed (A) aborally and (B) laterally (from the side); (x4.0, Seaford Chalk, Micheldever, Hampshire, BMNH (British Museum (Natural History) London) E20266.  Images  2005 The Natural History Museum, by kind permission.

 

2).  Detail of the above specimen; each ossicle possesses a central ridge ornamented with crater-like pits, some of which are rimmed (x8.0).  Image  2005 The Natural History Museum, by kind permission.