V.—On Dicellograpsus, a New Genus of Graptolites

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Abstract
The Graptolites for which the name Dicellograpsus is here proposed are usually included in the genus Didymograpsus, which is thus made to comprise two groups of species which are not only generically distinct, but belong to entirely different sections of the Graptolite family, the species properly belonging to Didymograpsus (D. Murchisoni for example) having hydrothecæ similar to those of Graptolithus, while the species erroneously included in the genus (D. Forchhammeri and others) have hydrothecæ of the type of Climacograptus. This was first pointed out by Prof. James Hall. In his “Graptolites of the Quebec Group” (p. 57) he removed these species from Didymograpsus, and placed them in his new genus Dicranograptus; the species previously known as Diplograpsus ramosus being considered the type of the genus. To this species, and to another then first described, the genus was afterwards restricted by Mr. Carruthers, the remaining species being again included in Didymograpsus. Though fully agreeing with Mr. Carruthers in thus restricting Dicranograptus, I cannot consider the species removed from it as having any alliance to Didymograpsus.

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