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The thecal form of some slender Llandovery Monograptus

Published online by Cambridge University Press:  01 May 2009

R. B. Rickards  and
A. W. A. Rushton
R. B. Rickards
Affiliation:
Department of Geology, Trinity College, Dublin.
A. W. A. Rushton
Affiliation:
Institute of Geological Sciences, London, S.W. 7.
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Summary

The thecal form of Monograptus argutus Lapworth and M. leptotheca Lapworth is similar to that of M. incommodus Törnquist, the type species of Pribylograptus Obut & Sobolevskaya; their thecae are geniculate and have introverted and laterally expanded apertures, and M. leptotheca has in addition apertural hoods. The relationships of these species are discussed.

Type
Articles
Information
Geological Magazine , Volume 105 , Issue 3 , June 1968 , pp. 264 - 274
Copyright
Copyright © Cambridge University Press 1968

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References

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