. Bulletin of the Buffalo Society of Natural Sciences. Natural history; Science. •24:4: Found four feet l)elow the base of the Trilobite beds, in Avery's Creek (rare); and very rarely in the shale between the Nautilus and Strophalosia beds. P T E RI X O P E C T E N UNDOSUS. Hall. ( Fig. 158.) (Pal. N. Y., Yol. Y., Pt. I., ^Iv j^ p. 72. Pis. II.,LXXXII.) ' ^- Distinguishing Cliaracters.— Length E'f ./) S' ureater than height; short hinge line; ^ w ,....Iv.^*^#^' concave margins of ears and wing; "^,_C^-^ sharp, crenulated striae; concentric un- FiG. 158. ptermnpecten un- duhitious; deep bv
. Bulletin of the Buffalo Society of Natural Sciences. Natural history; Science. •24:4: Found four feet l)elow the base of the Trilobite beds, in Avery's Creek (rare); and very rarely in the shale between the Nautilus and Strophalosia beds. P T E RI X O P E C T E N UNDOSUS. Hall. ( Fig. 158.) (Pal. N. Y., Yol. Y., Pt. I., ^Iv j^ p. 72. Pis. II.,LXXXII.) ' ^- Distinguishing Cliaracters.— Length E'f ./) S' ureater than height; short hinge line; ^ w ,....Iv.^*^#^' concave margins of ears and wing; "^,_C^-^ sharp, crenulated striae; concentric un- FiG. 158. ptermnpecten un- duhitious; deep bvssal uotcli of right dosns. Small specimen, jn-e- ., i . serving both valves, and show- \ al\ C. ing strong undulations (^from ,^ i ,.»\ • i i t-i • it/ \ Hall). l^ound (. ) 111 the Deniissa bed (rare). Genus PTERINEA. Goldflss. [Ety. : Pteron, a wing.] (1826: Peterfaot. Germ.) Yalves unecpial, left valve most convex. The shell is very oblique, the wing large, and the ear small. Two or more cardinal teeth and linear oblique lateral teeth occur. The hinge line is straight, and has a linear flattened marginal cartilage facet, which is longitudinally striat-i'd. The sur- face of the shell is ornamented by rays. P T E KI X E A F L A B E L L A . (Conrad.) (Fig. 159.) (Pal. \. Y., Yol. Y., Pt. L, p. 98, Pis. , LXXXin.) Distinguisl]ing Cliaracters. — Large size; convex left valve and flat or concave right valve; large, well-de- fined, triangular wing, with concave margin; small, rounded, well-defined ear; Fig. 159. Pterinea ftahelki. Left valve , i i i • , . (fromHall). sti-'oiig, rouiKted, (listaiit. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Buffalo Society of Natural Sciences. Buffalo, N. Y. : Buffalo Society of Natural Sciences
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