. Annual report on the New York State Museum of Natural History. Science. 228 Twenty-fourth Report on the State Museum. oblique, pointed below ; hinge line short; beak very small. Hinge plate occupied by six angular, crenulated, radiating teeth, which, diverging from beneath the beak, are strongly arched upwards between their origin and extremities; crenulations minute but very distinct; muscular impressions and pallial line not observed. DiiFers from L. jpoststriati and L. plana in the much shorter form and in number of teeth. Formation and locality. In the Hudson-river group at Cincinnati, O
. Annual report on the New York State Museum of Natural History. Science. 228 Twenty-fourth Report on the State Museum. oblique, pointed below ; hinge line short; beak very small. Hinge plate occupied by six angular, crenulated, radiating teeth, which, diverging from beneath the beak, are strongly arched upwards between their origin and extremities; crenulations minute but very distinct; muscular impressions and pallial line not observed. DiiFers from L. jpoststriati and L. plana in the much shorter form and in number of teeth. Formation and locality. In the Hudson-river group at Cincinnati, Ohio. From Mi-. C. B. Dyer. Tellinomta pectunculoides n. sp. Plate 7, fig. 2G. Shell small, subcircular in outline, with the posterior end slightly prolonged below the middle, giving a little obliquity to the shell; posterior cardinal border obliquely sloping to the point of greatest extension; anterior and basal borders regularly rounded; beaks small; general surface of the valves depressed convex. Hinge plate strongly arcuate, more abruptly curving in the middle, occupied by ton or twelve teeth on each side of the center, those in the middle being nearly straight, becoming more and more bent and angular toward the extremities; muscular impressions large and distinct; pallial line strongly marked, situated considerably within the border of the valve. Surface characters of the valves not observed. This species is more nearly circular than any species yet described from rocks of this age, and may be easily distinguished by this feature as well as the gentle convexity of the valves. Formation and locality. In shales of the age of tlie Hudson- river group, at Cincinnati, Ohio. In the cabinet of Mr. C. B. Dyer. Genus—CLIDOPHOEIIS Rail. Palaeontology of N. Y., vol 1, p. 300. When originally described, the species of this genus were supposed to be destitute of hinge teeth, or at least of crenulations like the Nuculse. Several years since, however, I had determined that some western
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