. A catalogue of the collection of Cambrian and Silurian fossils contained in the Geological Museum of the University of Cambridge. Paleontology; Paleontology. MIDDLE BALA GROUP. 47 Case and Column of Drawers. Reference to McCoy's Synopsis: and Figures of Genera. Gl Gl Gl Gl Gl Gl case G. Worm-trails, p. 129. p. 129. p. 130. PL 1 D, fig. 13. Worm-tubes, horny and shelly. T. annulatus, p. G3. G G PL 1 d, fig. 10, p. 133. See Upper Ludlow rock. Names and References; Observations, &o. Palaeaster asperrimus, Salter (Mem. Geol. Surv. III. pi. 23, fig. 2), with long blunt arms, and a very rough
. A catalogue of the collection of Cambrian and Silurian fossils contained in the Geological Museum of the University of Cambridge. Paleontology; Paleontology. MIDDLE BALA GROUP. 47 Case and Column of Drawers. Reference to McCoy's Synopsis: and Figures of Genera. Gl Gl Gl Gl Gl Gl case G. Worm-trails, p. 129. p. 129. p. 130. PL 1 D, fig. 13. Worm-tubes, horny and shelly. T. annulatus, p. G3. G G PL 1 d, fig. 10, p. 133. See Upper Ludlow rock. Names and References; Observations, &o. Palaeaster asperrimus, Salter (Mem. Geol. Surv. III. pi. 23, fig. 2), with long blunt arms, and a very rough upper surface. Palseaster ? same species crushed (Ast. primmva of Salter (not of Forbes) Decade I. Mem. Geol. Surv.), see list in Quart. Journ. Geol. Soc. Vol. I. p. 20, as before. Palseaster squamatus (Salter MSS.), upper side only. Protaster Petri (Salter MSS.), a new form, very like P. Sedgwickii, Forbes. Annelida—Traces, &c. Nereites Sedgwickii. This is the impression of the worm itself, and shews the broad lateral processes (elytra). The feet of marine worms are simple processes, with bunches of setce or bristles, and sometimes fleshy cirrhi. Nereites cambrensis, McLeay var. a. (Silur. Syst. pi. 27, fig. 1). Myrianites tenuis, McCoy. Here we have only the numerous coiling trails made by a nar- row worm-like body in the fine mud. Numbers and Localities. Tentaculites anglicus, Salter (Siluria, 2nd ed. pi. 1, fig. 3). Straight unattached womi tubes, resembling some horny Mediterranean species: and none still like the Comulites serpularius of the Wenlock and Dudley rocks. Trachyderma? lsevis, McCoy. (I strongly sus- pect this to be a fragment of Serpulites longissimus; and to have come from Upper Ludlow rock.) a. 222*, GftfcL. The origi- nal from near Welsh Pool, in Mus. Pract. Geology. a. 222, Moel-y-gamend. W. side of Bala Lake. a. 110, Bala. (Rev. J. Peters.) a. 108, Bala. (Rev. J. Peters.) a. 223, Thornielee Quarry, Tweed. Aberystwith. (Dr. Milligan.) Thornielee Quar
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