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II.—Morphological Studies on the Echinoidea Holectypoida and their Allies

Published online by Cambridge University Press:  01 May 2009

Herbert L. Hawkins
Herbert L. Hawkins
Affiliation:
Lecturer in Geology, University College, Reading.
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Extract

In the three preceding papers of this series descriptions have been given of the perignatliie girdles of familiar representatives of the three families into which the Holectypoida are at present divided. From the scanty evidence available, it would appear that in respect of this structure Plesiechinus is typical of the Pygasteridæ (even including Anorthopygus). The girtile of Holectypus seems essentially similar, thereby differing from that of the Discoidiinse; but as yet the perignathic structures of the Cretaceous Coenholectypus are unknown.

Type
Original Articles
Information
Geological Magazine , Volume 5 , Issue 1 , January 1918 , pp. 4 - 14
Copyright
Copyright © Cambridge University Press 1918

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