. A catalogue of the collection of Cambrian and Silurian fossils contained in the Geological Museum of the University of Cambridge. Paleontology; Paleontology. 140 SILURIAN. Case and Column of Drawers. Reference to McCoy's Sj-nopsis: and Figures of Genera. Names and References; Observations, &c. Numbers and Localities. Gc Gc8 Gd Gd2 Gc9 Gc Gd2. Leptcena, p. 243. Leptcena, p. 244. Leptcena, p. 236. Leptcena, p. 243. Leptcena, p. 245. Strophomena, Rafinesque. Easily distinguish- ed from Orthis by the broad expanded form —one valve being often bent on the other, and so flat as to leave very l
. A catalogue of the collection of Cambrian and Silurian fossils contained in the Geological Museum of the University of Cambridge. Paleontology; Paleontology. 140 SILURIAN. Case and Column of Drawers. Reference to McCoy's Sj-nopsis: and Figures of Genera. Names and References; Observations, &c. Numbers and Localities. Gc Gc8 Gd Gd2 Gc9 Gc Gd2. Leptcena, p. 243. Leptcena, p. 244. Leptcena, p. 236. Leptcena, p. 243. Leptcena, p. 245. Strophomena, Rafinesque. Easily distinguish- ed from Orthis by the broad expanded form —one valve being often bent on the other, and so flat as to leave very little room for the animal. The general characters are much the same as in Orthis. But the car- dinal process is invariably double, not single. Leptagonia, McCoy, is only a Strophomena. And the Professor has placed all this genus, natural as it is, under the general term Leptcena, Dalman, which is best restricted, as Davidson and myself have done, to the involute species with long, instead of square dorsal muscles. Strophomena euglypha, Dalman (Siluria, 2nd ed. pi. 20, fig. 19). Davidson, Lond. Geol. Journ. Vol. I. pi. 12, figs. 1—4 ?). Most com- mon. The dorsal valve bends down over the ventral, which is bent backwards. Strophomena funiculata, McCoy (Orthis, Sil. Foss. Ireland, pi. 3, fig. 11. Davidson, Lond. Geol. Journ. t. 12, fig. (J, Siluria, 2nd ed. p. 251). Bent in the reverse way to S. eugly- pha, and a miniature copy of that species. Strophomena Ouralensis, De Vern. (Geol. Russ. t. 14, fig. 1, S. imbrex, Davidson, and Sal- ter, Siluria, Foss. 58, fig. 6, not of Pander). Gently curved, the ventral valve the convex one. This differs from Pander's 0. imbrex, which is narrower, and abruptly bent down. The interior is beautifully shewn in David- son's figures. Strophomena filosa, Sow. sp. (Orthis, Sil. Syst. t. 13, fig. 12, Siluria, 2nd ed. pi. 20, fig. 21, Davidson, Lond. Geol. Journ. Vol. I. p. 62). A common flat species, beautifully striate. Strophomena Pecten, Linn.
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