. A catalogue of the collection of Cambrian and Silurian fossils contained in the Geological Museum of the University of Cambridge. Paleontology; Paleontology. 66 UPPER CAMBRIAN. Case and Column of Drawers. Reference to McCoy's Synopsis: and Figures of Genera. 6m Gm Area, PL 1 k, tigs. 2, 3, p. 283. Nucula levata, PL 1 k, figs. 4, 5, p. 285. p. 284. Gm. Sea Butterflies generally of large size. Gm Names and Eeferences: Observations, &c. Ctenodonta Edmondiiformis, McCoy. Ctenodonta varicosa, Salter, Siluria, 3rd ed. woodcut 39, fig. 4. Mem. Geol. Surv. in. p. 345, woodcut 13, fig. 1, p. 343.
. A catalogue of the collection of Cambrian and Silurian fossils contained in the Geological Museum of the University of Cambridge. Paleontology; Paleontology. 66 UPPER CAMBRIAN. Case and Column of Drawers. Reference to McCoy's Synopsis: and Figures of Genera. 6m Gm Area, PL 1 k, tigs. 2, 3, p. 283. Nucula levata, PL 1 k, figs. 4, 5, p. 285. p. 284. Gm. Sea Butterflies generally of large size. Gm Names and Eeferences: Observations, &c. Ctenodonta Edmondiiformis, McCoy. Ctenodonta varicosa, Salter, Siluria, 3rd ed. woodcut 39, fig. 4. Mem. Geol. Surv. in. p. 345, woodcut 13, fig. 1, p. 343. Cucullella antiqna? Sow. (Siluria, 2nd ed. pi. 34,.fig. 16). Palffiarca, Hall (Cyrtodonta, Billings. Cypricar- dites, Hall). With the general structure of Cucullaea these ancient bivalves want the posterior internal plate, and are closely re- lated to Ctenodonta, and have affinity with Pterinea. Several species are known at Bala, and should be added to the collection. PTEROPODA AND HETEROPODA (or Nucleobranchiata). The Pteropods are among the Mollusca the most simple in structure of the cephalate orders. They are also the most ancient. The Heteropoda or Nucleobranchs are low down in the scale, being nearest like the embryos of Gasteropods. Both Pteropodaand Hetero- poda grew to an enormous size in the older Palaeozoic times. Theca, Morris, 1844. A triangular Pteropod shell, with an operculum (Barrande). The genus is related to the much smaller living genus Creseis, Rang. These were floaters, and as such the genus had a very wide range in olden time. Such fossils too, not being subjected to the full force of local elevation, have been usually long lived. Theca is found all through the Lower and Upper Cambrian to the Devonian epoch. Theca reversa, Salter (T. Forbesii, Hall, not of Sharpe, figured in Siluria, 3rd ed. p. 199, Foss. 41, fig. 1). Mem. Geol. Surv. Vol. in. p. 353 (woodcut 14, fig. 6, p. 347). Numbers and Localities. a. 212, Alt-y-Gader. a. 164, Milltir Cerrig (milest
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