. Bulletin of the Buffalo Society of Natural Sciences. Natural history; Science. 308 some extent, along the anterior and posterior ends. Yalves smooth, obk)ng", and liorny. Leperditia H^DSO^â ICA. Hall. (Fig, 250.) (Pal. X. Y., Vol. III.,, 1859, p. 375.) Distinguishing (Imracters.âSynnnet- rical, very convex (snb-globular) form, almost as thick as high; straight dorsal border, with the anterior cardinal angle more developed than the posterior: well-rounded free margins, with anterior extremity less truly rounded than the posterior. Found in the Encrinal limestone (?).at ''Eighteen Mile Cr
. Bulletin of the Buffalo Society of Natural Sciences. Natural history; Science. 308 some extent, along the anterior and posterior ends. Yalves smooth, obk)ng", and liorny. Leperditia H^DSO^â ICA. Hall. (Fig, 250.) (Pal. X. Y., Vol. III.,, 1859, p. 375.) Distinguishing (Imracters.âSynnnet- rical, very convex (snb-globular) form, almost as thick as high; straight dorsal border, with the anterior cardinal angle more developed than the posterior: well-rounded free margins, with anterior extremity less truly rounded than the posterior. Found in the Encrinal limestone (?).at ''Eighteen Mile Creek. Lake Erie Shore. New York State.'' (Jones.). Fig. 250. Leperditiahud- sonica. Lateral edge and end views of a right valve. X 25 (after Jones). Genus JECHIMIXA. Jones and Holl. [Ety. : Aichine, a sharp point.] (Ann. and Mag. Nat. Hist., Ser. IV., Vol. III., p. 217.) Carapace with thick valves, straight at hinge line, rounded at the ends, and convex at the ventral border. Surface drawn out into a broad-based and sharp-pointed hollow cone, which either involves the whole surface, or rises from the posterio-dorsal or centro-dorsal region. .EcHiMLXA MARGiNATA. Ulrich. (Fig. 251.) (Journ. Cin. Soc. Nat. Hist., Yol. XHI., p. 181, PI. XYI.) Distinguishing Cliaracters.â Small size: elongate form; narrowed anterior- ly : straight and long dorsal margin, with obtuse angles: nearly semi-circular free margin, with a slightly elevated marginal rim: very long and slender spine. Found in the ''shales of the Hamilton group, in Eighteen Mile Creek, X. ;' (Ulrich.) Fig. 251. ^chimina marginata. Left valve, x 20 (after Ulrich).. 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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