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IV.—On the Evolution of the Apical System in the Holectypoida

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 two previous papers in this Magazine (Hawkins, 1910 and 1911) I have dealt with some features in the comparative anatomy of the ambulacral and interambulacral areas of the Holectypoida. The only other structure of the test for a comparative study of which sufficient material is available is the apical system. The present paper deals with this structure. I intend to summarize the results of my researches in a scheme for the classification and evolution of the group in a paper already partly prepared.

Type
Original Articles
Information
Geological Magazine , Volume 9 , Issue 1 , January 1912 , pp. 8 - 16
Copyright
Copyright © Cambridge University Press 1912

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References

1 This name is systematically indefensible, being synonymous with Agassiz's Pygaster whose type is P. semisulcatus. I use it in inverted commas here to avoid systematic discussions in a morphological paper.