. A catalogue of the collection of Cambrian and Silurian fossils contained in the Geological Museum of the University of Cambridge. Paleontology; Paleontology. MIDDLE CAMBRIAN. Case and Column of Drawers. Reference to McCoy's Synopsis : and Figures of Genera. Gh Gh Gh Gh G Gh Brachiopods. Bivalves protected by up- per and lower shells, not by side-plates as in ordinary bi- Bracliiopods have spiral arms, which are probably the labial tentacles. The respi- ration is carried on, not by gills, but by the mantle-sur- face. Brachiopods (the horny kinds) precede the ordinary bivalves in time
. A catalogue of the collection of Cambrian and Silurian fossils contained in the Geological Museum of the University of Cambridge. Paleontology; Paleontology. MIDDLE CAMBRIAN. Case and Column of Drawers. Reference to McCoy's Synopsis : and Figures of Genera. Gh Gh Gh Gh G Gh Brachiopods. Bivalves protected by up- per and lower shells, not by side-plates as in ordinary bi- Bracliiopods have spiral arms, which are probably the labial tentacles. The respi- ration is carried on, not by gills, but by the mantle-sur- face. Brachiopods (the horny kinds) precede the ordinary bivalves in time. Univalves. (Sea Butterflies.) The Pterojiods are greatly developed in the very oldest rocks; and are low forms of mollusks, floating and almost flying in deep water by means of the double-lobed foot. The breathing cavity is a ciliated surface. The operculum has been discovered in many spe- cies. Names and References ; Observations, &c. MOLLUSCA Brachiopoda. Discina? pileolus sp. Salter. Minute cap-shaped homy Brachiopods are found in all the Pa- leozoic deposits. (For genus see Bala group). Obolella? sagittalis, Salter (Davidson, earliest Brach. Geol. Mag. 1868, Vol. v. pi. 15, figs. 17—24). The genus not quite certain, but Obolella is common in old rocks. Obolella nucleata, MSS. A very small apicu- late species. Obolella maculata, Hicks, ib. pi. 16, figs. 1—3. Lingulella ferruginea, Salter (ib. pi. xv. figs. 1—4). The earliest Lingulce differed from modern ones in having a groove under the beak for the passage of the pedicle, and thus being more like Obolus. Quart. Geol. Journ. 1867, Vol. xxiii. p. 340, fig. 1. (See p. 2.) Orthis Hicksii, n. sp., Davidson (ib. pi. 16, fig. 17). Very like 0. Carausii, Salter, but with a short hinge. (For genus, see Arenig Group.) MOLLUSCA Pteropoda. Theca obtusa, Salter (Mem. Geol. Surv. Vol. III. p. 352, fig. 17). A large species of a genus like the much smaller living Creseis. Theca corrugata, Salter (Quart. Geol. Journ. Vol. XX.
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