. A catalogue of the collection of Cambrian and Silurian fossils contained in the Geological Museum of the University of Cambridge. Paleontology; Paleontology. WEN LOCK GROUP. 143 Case and Column of Drawers. FC Gdl Reference to McCoy's Synopsis: and Figures of Genera. Spirigerina, p. 198. Gdl Gd Spirigerina, p. 197. FC var. of S. marginalia, p. 197. Gd4 Hemithyris, p. Gd Gdl Hemithyris, p. 205. Names and References; Observations, &c. Atrypa reticularis, Linn. (Anomia reticularis, Syst. Naturae, 12th ed. Siluria, 2nd ed. pi. 21, figs. 12, 13, Davidson, 1. c. t. 14). Strong lamellar fr
. A catalogue of the collection of Cambrian and Silurian fossils contained in the Geological Museum of the University of Cambridge. Paleontology; Paleontology. WEN LOCK GROUP. 143 Case and Column of Drawers. FC Gdl Reference to McCoy's Synopsis: and Figures of Genera. Spirigerina, p. 198. Gdl Gd Spirigerina, p. 197. FC var. of S. marginalia, p. 197. Gd4 Hemithyris, p. Gd Gdl Hemithyris, p. 205. Names and References; Observations, &c. Atrypa reticularis, Linn. (Anomia reticularis, Syst. Naturae, 12th ed. Siluria, 2nd ed. pi. 21, figs. 12, 13, Davidson, 1. c. t. 14). Strong lamellar fringes roughen the whole shell and double its bulk, but these are rarely preserved, except in shale, being of course entangled in the matrix. Atrypa marginalis, Dalm. (Siluria, 2nd ed. pi. 22, fig. 19, in pt., Davidson, 1. c. t. 15, figs. 1, 2). Almost as common as the last in Silurian rocks, and ranging down to Middle Bala, but never rising above Silu- rian. The defined sinus in the front, and the moderately narrow striae, distinguish it from the next form. Atrypa imbricata, Sow. (Sil. Syst.) Siluria, 2nd ed. pi. 22, fig. 19, in pt. Davidson, Sil. Brach. t. 15, figs. 3—8. Coarse and few ribs, and the want of a defined medial sinus, and the rough imbrication, are cha- racters. Atrypa? Grayii, Davidson (Sil. Brach. p. 141, t. 13, figs. 14—22, Rhynchonella, Siluria, 2nd ed. Foss. 57, fig. 3). Athyris? depressa, Sow. (Davidson, Sil. Brach. t. 13, fig. 6). Athyris? compressa, Sow. (Siluria, 2nd ed. pi. 22, fig. 22). Nucleospira, Hall. Spiral calcified arms, and a minute area in either valve, aud a smooth surface, mark this obscure genus. Nucleospira pisum, Sow. (Spirifer? Sil. Syst. and Siluria, 2nd ed. pi. 21, fig. 7, Davidson, Sil. Brach. t. 10, figs. 1G—20). Numbers and Localities. a. 777, ventral valve in- terior; a. 778, dorsal valve interior; a. 780, Dudley F. C; b. 756, Wenlock | b. 757, Sedgley ; Myddle- ton Park (Wenlock Shale), Caermarthen; b. 760, Coed Sion, Llangad
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