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II—On the Structure and Affinities of the Genus Dicrangraptus

Published online by Cambridge University Press:  01 May 2009

John Hopkinson
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Extract

The name Dicranograptus was proposed by Hall, in his Memoir on the “Graptolites of the Quebec Group” (p. 112), for certain forms of Graptolites, some of which were then included in the genus Didymograpsus, and others in Diplograpsus. He, however, only considered these forms as constituting a sub-generic group of his genus Climacograptus, believing them to have a similar structure.

Type
Original Articles
Information
Geological Magazine , Volume 7 , Issue 74 , August 1870 , pp. 353 - 359
Copyright
Copyright © Cambridge University Press 1870

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References

page 354 note 1 Geological Magazine, Vol. V., p, 132.

page 354 note 2 Journ. Quekett Micros. Club, vol. i., p. 160.

page 354 note 3 That the two series of hydrothecæ are really thus isolated, I am by no means certain. Pending further investigation, I quote the view generally entertained.

page 354 note 4 Grapt. Quebec Group, pl. A., fig. 4–8.

page 355 note 1 Quart. Journ. Geol. Soc, vol. xxiv., p. 528.

page 355 note 2 Ueber Grapt., pl. ii., fig. 17–22.