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Notes on the Fauna of the Lower Devonian Beds of Torquay

Published online by Cambridge University Press:  01 May 2009

F. R. Cowper Reed
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Extract

Definition.—Shell large, elliptical, subquadrate; valves moderately convex; inferior margin very slightly curved, almost straight; posterior end well rounded above, truncated below and straight, meeting inferior margin at rather more than a rightangle; cardinal margin very slightly arched, nearly straight, but passing gradually into posterior margin; anterior end rounded. Beak large, rounded, prominent, subcentral, elevated above hingeline, incurved, not directed forwards. Umbonal ridge nanow, straight, running obliquely backwards to posterior lower angle of valve and causing a slight angulation of the surface. Shell ornamented with regular equidistant sharp concentric lamellose striæ about 30–40 in number, rather suddenly bent at an obtuse angle on crossing the umbonal ridge.

Type
Original Articles
Information
Geological Magazine , Volume 59 , Issue 7 , July 1922 , pp. 303 - 309
Copyright
Copyright © Cambridge University Press 1922

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References

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