. 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. 59 Caso and Column of Drawers. Gl Gl Reference to McCoy's Synopsis : and Figures of Genera. PI. 1 H, figs. 41, 42, p. 223. p. 210. Gl p. 221. Gl G p. 221. Spirifera, p. G G G Gl p. 192. Spirifera, p. 192. p. 192. Spirifera, p. 193. Names and References; Observations, &c. Orthis, sp. near to 0. porcata. Orthis elegantula, Dalm. (Siluria, 2nd ed. pi. 5, fig. 5). The weed of the Silurian and Upper Cambrian rock
. 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. 59 Caso and Column of Drawers. Gl Gl Reference to McCoy's Synopsis : and Figures of Genera. PI. 1 H, figs. 41, 42, p. 223. p. 210. Gl p. 221. Gl G p. 221. Spirifera, p. G G G Gl p. 192. Spirifera, p. 192. p. 192. Spirifera, p. 193. Names and References; Observations, &c. Orthis, sp. near to 0. porcata. Orthis elegantula, Dalm. (Siluria, 2nd ed. pi. 5, fig. 5). The weed of the Silurian and Upper Cambrian rocks; appearing under many varieties in Britain and Sweden; ap- parently unknown in S. Europe. Numbers and Localities. Orthis parva, Pander. Considered a distinct species by De Verneuil and McCoy, and others. I think it only a sharply ribbed variety of 0. elegantula, with which it is generally intermixed. Orthis parva, var. avellana, De Verneuil. Geol. Russ. t. 13, figs. 3, 4. Orthis biforata, Sehloth. (Davidson, Pal. Soc. Introd. pi. 8, fig. 146). One of the commonest of the Bala types, ranging from Lower Bala to Wenlock rocks. It looks like a Spirifer, and was so named by Prof. McCoy, as it had been by other authors. There are no internal shelly spires. It is easily divisible into — Orthis biforata, proper, with 6 to 9 ribs on the raised front. Orthis biforata, var. a Lynx (Spirifer, Eichwald &c), 4 ribs on the fold. Orthis biforata, var. /3 dentatus. Orthis fissicostata, seems quite distinct. Orthis (0. biforata, v&), McCoy. Mynydd-y-gaer, Llanefydd. Everywhere in the Bala rocks; in Caernarvonshire at Pwllheli; Snowdon; Moel Hebog, &c. All round Bala Lake in Merioneth- shire. The Berwyns, east side (MilltirCerrig), Welch- pool; Meifod; Moel Uch- las near Llanfyllin; Hor- derley; Acton Scott; and all the Caradoc district. DinasMowddwy; Llansant- fraid, Glyn Ceiriog; Bryn Melyn,Bala; YspyttyEvan. Moel Uchlas, &c. Ardwell, Girvan, Ayrshir
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