. Bulletin of the Buffalo Society of Natural Sciences. Natural history -- New York (State); Natural history. 250 obliquely from beak to base, and the surface is marked by rugose, or undulating, concentric lines. The hinge bears a strong tooth in the lefl valve, which fits into a cavity in the right valve. The ligament is external and is attached to the thickened margin of the shell, which is often longitudinally grooved for its reception. Modiomorpha concentrica. (Conrad.) () (Pal. \. Vol. Pt. p. 27o. Pis. XXXVI.) Distinguishing Clianatrrs—Qynte outline: stra
. Bulletin of the Buffalo Society of Natural Sciences. Natural history -- New York (State); Natural history. 250 obliquely from beak to base, and the surface is marked by rugose, or undulating, concentric lines. The hinge bears a strong tooth in the lefl valve, which fits into a cavity in the right valve. The ligament is external and is attached to the thickened margin of the shell, which is often longitudinally grooved for its reception. Modiomorpha concentrica. (Conrad.) () (Pal. \. Vol. Pt. p. 27o. Pis. XXXVI.) Distinguishing Clianatrrs—Qynte outline: straight or slightly concave basal margin; arcuate to straight cardinal. Fig. 165. Modiomorpha concentrica. Right side of a large individual, showing the arcuate form characteristic of old individuals (from Hall . margin; rounded, projecting, well-defined, anterior end; strong, regular concentric lines. Found in the Encrinal limestone, at Section 5 (common); in the shale, at twenty-five feet below the Encrinal and be- low the Trilobitebeds, and in the Pleurodictyum beds, on the Lake Shore l rare). Modiomorpha rub-alata. (Conrad.) (Fig. 166.) (Pal. V Vol. Pt. I., p. 283, Pis. XXXIX.) Distinguishing Characters.— Sub-quadrangular to sub- ovate outline; sub-alate posterio-dorsal portion: well- marked umbonal ridge, passing from beak to base; large, but ill-defined, anterior end; sub-truncate posterior end. Found in the shale below the Demissa bed and below the Athyris bed (rare); also in the Modiomorpha sub-alata bed, in Idlewood Ravine, and on the Lake Shore (in great. 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. : The Society
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