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Recent Work on the Phacopidae

Published online by Cambridge University Press:  01 May 2009

F. R. Cowper Reed
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Extract

It is worth while to examine the value and definition of certain of the older generic or sub-generic groups, for there is much difference in the usage of the terms, and in the interpretation of their rank and value. This is especially the case with Acaste and Phacopidella, for the author of the latter name wrongly included in it such forms as Ac. downingiae and others of a diverse type, though they differed in important particulars from the species Ph. glockeri Barr. which he chose as the type of Phacopidella as above observed (see Glockeria). Other new and old generic terms appear to have been also used in too broad a sense, and there is no general agreement as to their limitation.

Type
Original Articles
Information
Geological Magazine , Volume 64 , Issue 8 , August 1927 , pp. 337 - 353
Copyright
Copyright © Cambridge University Press 1927

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