. A catalogue of the collection of Cambrian and Silurian fossils contained in the Geological Museum of the University of Cambridge. Paleontology; Paleontology. Lepktna, p. 243. Leptarjonia, p. 248. Leptcena, p. PI. li, figs. 11—15, p. 258. p. 261. P. var. naviformis, p. 2G3. p. 2G2. Pterinea lineata, p. 261. Orthis lunata, Sow. (Siluria, 2nd ed. pi. 20, fig. 11). This very fine-ribbed shell is often mistaken; but if the interior characters of the hinge be studied with the outside, no difficulty ought to be felt in separating it from its companion 0. orbicularis, a coarser shell with fasc
. A catalogue of the collection of Cambrian and Silurian fossils contained in the Geological Museum of the University of Cambridge. Paleontology; Paleontology. Lepktna, p. 243. Leptarjonia, p. 248. Leptcena, p. PI. li, figs. 11—15, p. 258. p. 261. P. var. naviformis, p. 2G3. p. 2G2. Pterinea lineata, p. 261. Orthis lunata, Sow. (Siluria, 2nd ed. pi. 20, fig. 11). This very fine-ribbed shell is often mistaken; but if the interior characters of the hinge be studied with the outside, no difficulty ought to be felt in separating it from its companion 0. orbicularis, a coarser shell with fasciculate striae. The teeth of the dorsal valve are nearly parallel and the central cardinal process linear. Strophomena filosa, Sow. (see p. 146). More common in Ludlow rocks than elsewhere; at Ludlow it varies exceedingly in the sculp- ture. Strophomena depressa, Sow. (see p. 147). Clionetes lata, Von Buch, (regarded by some as the true C. striatella of Dalman) but the references in the 3rd ed. of Siluria are so confused and sterile that no use can be made of them. The best fig. is that in Siluria, 2nd ed. pi. 20, fig. 8. LAMELLIBRANCHIATA. Avicula Danbyi, McCoy. Generally wide oval, a large fine shell. It varies much. Pterinea lineata, (Pet. Germ., , fig. 6). A beautiful shell, close to P. retroflexa, but with long wing, and very fine regular radiating ridges of striae. (See P. lineatula.) Pterinea retroflexa, Wahl. sp. (His. Leth. Suec. t. 17, fig. 12). Has convex right valve, var. naviformis of Conrad. Pterinea retroflexa, var. erecta, McCoy. Pterinea lineatula, D'Orb. (Siluria, pi. 23, fig. 16). Extremely common in Ludlow rock. b. 976, Kington, Hereford- shire ; b. 978, Woolhope; b. 979, Mortimer's Cross, Aymestry; b. 980, Down- ton Castle, Ludlow; b. 981, Leintwardine; b. 982, Ben- son Knott, Kendal. b. 983, Burton and Brock- ton, near Wenlock. b. 984, Burton and Brock- ton, near Wenlock. b. 985, near Woolhope; b. 986, Benson Knott, Kendal; ,Lambrigg F
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