. Bulletin of the Buffalo Society of Natural Sciences. Natural history; Science. 807 wide marginal frill; surface with three rounded tubercles, one near the posterio-cardinal angle, an- other, perhaps twice as large, near the center of the dorsal margin, the third, smaller than either, between Fig. 248. Beyrichia tricoUina. and a little beneath them; addi- a left vaiye, with the rriii broken away at the anterior end, x 30 tional slight swellings in the pos- (after uirich). terio-ventral fourth; moderate depression between largest and smallest tubercles. P'ound in the "shales of the Hamilt
. Bulletin of the Buffalo Society of Natural Sciences. Natural history; Science. 807 wide marginal frill; surface with three rounded tubercles, one near the posterio-cardinal angle, an- other, perhaps twice as large, near the center of the dorsal margin, the third, smaller than either, between Fig. 248. Beyrichia tricoUina. and a little beneath them; addi- a left vaiye, with the rriii broken away at the anterior end, x 30 tional slight swellings in the pos- (after uirich). terio-ventral fourth; moderate depression between largest and smallest tubercles. P'ound in the "shales of the Hamilton grouj), in Eighteen Mile Greek, N. ; (Uirich, type.). Genus ISOCHILINA. Joxes. [Ety. : Isos, equal; cheilos, lip.] (1858: Can. Org. Remains, Decade 3, p. 197.) Carapace with e(|ual valves, whose margins meet uni- formly and do not overlap. (Greatest convexity central, or towards the anterior end; anterior tubercle present. IsocHiLixA (?) FABACEA. Jones. (Fig. 249.) (Quart. Journ. Geol. Soc, Vol. XLVL, p. 22, PL II.) Distinguishing Characters.—"Narrow, oblong, bean- shaped, straight above, gently curved below, semi-circular in front, obli(piely rounded behind; faintly impressed in the middle of the dorsal region ; sloping gently dorsally, and more abruptly on the free margins; surface apparently punctate, but in reality delicately reticulate, all ; Found in the "Hamilton gi'oup, Eighteen Mile Creek, Lake Erie Shore. X. ; (Jones.) Fig. 249. Isochilina (.?) fabacea. Left valve, x 25 (after Jones). Genus LEPERDITIA. Ronault. [Ety. : Lepis, scale; dittos, double. ] (1851: Bull. Soc. Geol. France, 2d Ser., T. VIII., p. 377.) Carapace with unequal valves, the right valve the larger and overlapping the left valve, along the ventral and, to. 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 origi
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