. A catalogue of the collection of Cambrian and Silurian fossils contained in the Geological Museum of the University of Cambridge. Paleontology; Paleontology. WENLOCK GROUP. 139 Case and Column of Drawers. Reference to McCoy's Synopsis: and Figures of Genera. Names and References; Observations, &c. Numbers and Localities. Gdl Gd3 Gd3 Gd3 FC Gdl Gd3 Gd3 Gd3 Gc8 FC Spondylobolus craniolaris, p. 255. PI. 1 H, figs. 4, Athyris, p. 196. Eemithyris, p. 201. Athyris obovata, Sow. sp. (Siluria, 2nd ed. pi. 22, fig. 16, Dav. Sil. Brach. p. 121, t. 12, fig. 19, t. 13, fig. 5). Meristella Circe,
. A catalogue of the collection of Cambrian and Silurian fossils contained in the Geological Museum of the University of Cambridge. Paleontology; Paleontology. WENLOCK GROUP. 139 Case and Column of Drawers. Reference to McCoy's Synopsis: and Figures of Genera. Names and References; Observations, &c. Numbers and Localities. Gdl Gd3 Gd3 Gd3 FC Gdl Gd3 Gd3 Gd3 Gc8 FC Spondylobolus craniolaris, p. 255. PI. 1 H, figs. 4, Athyris, p. 196. Eemithyris, p. 201. Athyris obovata, Sow. sp. (Siluria, 2nd ed. pi. 22, fig. 16, Dav. Sil. Brach. p. 121, t. 12, fig. 19, t. 13, fig. 5). Meristella Circe, Barr. (Davidson, Sil. Brach. p. 116, t. 10, figs. 33—35). Differs chiefly from Merista, its ally in Bohemia, by the attachment of the muscles to the ventral valve. In this they are attached directly to the shell. In the Bohemian form they are first attached to an arched shelly pro- cess, and this to the rest of the shell. Meristella tumida, Dalman, sp. (Davidson, Sil. Brach. p. 109,, figs. 1—13, Athyris, Siluria, 2nd ed. pi. 22, fig. 20). Equally common in Sweden. Meristella didyma, Dalm. (Davids. t. 12, figs. 1—10, Siluria, 2nd ed. pi. 22, fig. 15). More common in the Aymestry Limestone. Meristella lseviuscula, Sow. (Terebratula, Sil. Syst. pi. 13, fig. 14, Siluria, 2nd ed. pi. 22, fig. 14, , Davidson, Sil. Brach. t. 10, figs. 28—32). A small edition of the last. Eichwaldia Capewellii, Davidson (Sil. Brach. p. 193, t. 25, figs. 12—15, Rhynchonella, Salter, Siluria, 2nd ed. Foss. 57, fig. 4. Porambonites, Siluria, 3rd ed. p. 226). A curiously netted surface on the shell. Retzia. A shell like Rhynchonella, but having the internal arm-supports wholly calcified. The shell is largely punctate. Retzia Barrandii, Davidson (Sil. Brach. p. 128, t. 13, figs. 10—13, Siluria, 2nd ed. Foss. 57, fig- 5). Retzia Salteri, Davidson (1. c. t. 12, figs. 21, 22, Siluria, 2nd ed. Foss. 57, fig. 7, p. 250). Easily distinguished by the centre ribs beino- much smaller. a
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