. Annual report of the Regents of the University on the condition of the State Cabinet of Natural History, with catalogues of the same. State Cabinet of Natural History (N. Y. ); Science; Museums. 90 [Senate EaTONIA MEDIALIS. Atrypa medialis, Vanuxem. Vol. iii, pi. 37, f. 1. Shell transversely oval, suborbicular or subqiiadrate ; hinge nearly straight, and forming a very obtuse angle at the beaks : dorsal valve much larger than the ventral, greatly elevated in the middle (especially near the front), declining with a gentle curve laterally and towards the hinge : ventral valve flat or
. Annual report of the Regents of the University on the condition of the State Cabinet of Natural History, with catalogues of the same. State Cabinet of Natural History (N. Y. ); Science; Museums. 90 [Senate EaTONIA MEDIALIS. Atrypa medialis, Vanuxem. Vol. iii, pi. 37, f. 1. Shell transversely oval, suborbicular or subqiiadrate ; hinge nearly straight, and forming a very obtuse angle at the beaks : dorsal valve much larger than the ventral, greatly elevated in the middle (especially near the front), declining with a gentle curve laterally and towards the hinge : ventral valve flat or concave, depressed in front so as to form a broad and profound mesial sinus; beak very small, pointed but not prominent, incurved, perforate at the extremity. Surface marked by from twelve to sixteen broad rounded rarely bifurcating plications, four of Avhich usually occupy the summit of the mesial fold of the ventral valve, and about three the bottom of the sinus in the dorsal valve : lines of growth obscure. The visceral im- pression in the ventral valve moderately large, ovate, very distinctly defined by a prominent border, and marked by lon- gitudinal slightly radiating plications : near its centre is the small cordiform longitudinally striate impression of the adductor muscle. Associated ?with this species are a few forms, -which, although differing materially from it, I am at present inclined to regard as merely extreme varieties of the same species. Some of these are given on the same plate ( See fig. 1 a, b, c, d, e, f, g). In some instances (such as 1 c, d, f & g),. EatoXIA 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 State Cabinet of Natural History (N. Y. ); University of the State of New York. Board of Regents. Albany, N. Y. : University of the State of New York
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectm, booksubjectscience
