. A catalogue of the collection of Cambrian and Silurian fossils contained in the Geological Museum of the University of Cambridge. Paleontology; Paleontology. 20 MIDDLE CAMBRIAN. Case and Column of Drawers. Keference to McCoy's Synopsis : and Figures of Genera. Gi Under Orapt. latus, p. 4. (Not the figure or description, which belongs to G. priodon, PI. 1 B, fig. 7.) Gi Gi Gi Gi. Gi Names and ^References ; Observations, &c. Didymograpsus latus, Salter. The specimens to which I restrict the name are from Skiddaw slate localities, and are broken portions of a twin graptolite. The specific n
. A catalogue of the collection of Cambrian and Silurian fossils contained in the Geological Museum of the University of Cambridge. Paleontology; Paleontology. 20 MIDDLE CAMBRIAN. Case and Column of Drawers. Keference to McCoy's Synopsis : and Figures of Genera. Gi Under Orapt. latus, p. 4. (Not the figure or description, which belongs to G. priodon, PI. 1 B, fig. 7.) Gi Gi Gi Gi. Gi Names and ^References ; Observations, &c. Didymograpsus latus, Salter. The specimens to which I restrict the name are from Skiddaw slate localities, and are broken portions of a twin graptolite. The specific name may stand, as unoccupied. Didymograpsus, sp. very possibly identical. like D. latus, and Numbers and Localities. Compound Graptolites, di- chotomously branched on one plane. Didymograpsus geminus, Hisinger (Leth. Suec. Supp. 2, pi. 38, fig. 3). It is a Stiper Stones species, also found at Whitesand Bay. Mem. Geol. Surv. Vol. in. pi. 11 B, fig. 8. Didymograpsus V-fractus, Salter (Quart. Journ. Geol. Soc. xix. p. 137, fig. 13 e). A species closely related to D. Pantoni, McCoy, from Australia. Didymograpsus Hirundo, Salter (Quart. Journ. Geol. Soc. xix. p. 137, fig. 13 f). D. constric- tus, Hall (Grapt. Quebec, pi. 1, fig. 23—27). Tetragrapsus bryonoides, Hall {Graptolithus, ib. pi. ill. IV. VI.). A Graptolite with 4 thick branches recurved. Quart. Journ. Geol. Soc. ib. fig. 8 a. The genus is like Didymograp- sus, but twice branched. Tetragrapsus quadribrachiatus, sp. Hall (1. c. pi. 5). Tetr. crucialis, Salter (Quart. Journ. Geol. Soc. ib. fig. 8 b). Quite a distinct spe- cies, with much longer and patent branches. Dichograpsus, Salter. A large branching Grap- tolite, first discovered in Canada by Sir W. E. Logan. It is the most compound of Graptolites, excepting Dendrograpsus and Dictyonema. This is a more compound form of Graptolite than Tetragrapsus, the branches bifurcating again and again, but only in one plane. Moreover a horny disk connects the base of the branches i
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