. Annual report of the regents of the university of the state of New York on the condition of the State Cabinet of Natural History and the historical and antiquarian collection annexed thereto. Science. NOTICE OF PALEONTOLOGY OF NEW-YORK, VOLUME IV. 167 Fig. 2.# Longitudinal section of the dorsal j. Cardinal process. b. Tooth-socket. c. Crural processes. I. Loop. s. Septum. In the punctate texture of this shell, it differs from either of the Genera Lept^na, Strophomena or Strophodonta; but this might not be an objection to admitting Tropidoleptus into the family, were the other charact
. Annual report of the regents of the university of the state of New York on the condition of the State Cabinet of Natural History and the historical and antiquarian collection annexed thereto. Science. NOTICE OF PALEONTOLOGY OF NEW-YORK, VOLUME IV. 167 Fig. 2.# Longitudinal section of the dorsal j. Cardinal process. b. Tooth-socket. c. Crural processes. I. Loop. s. Septum. In the punctate texture of this shell, it differs from either of the Genera Lept^na, Strophomena or Strophodonta; but this might not be an objection to admitting Tropidoleptus into the family, were the other characters coincident. The area is longitudinally striated, and presents a different aspect from any of the Strophomenid^, but has analogy with some of the Orthides. The teeth are not extensions of the lamellae bounding the foramen, but distinct from it and deeply crenulate or lobed, and inserted into corresponding crenulate sockets in the dorsal valve. The form of mus- cular impressions, so far as known, is not very dissimilar to those of Stro- phomena or Orthis. In comparing the form of the cardinal process and its appendages, we shall find it almost entirely similar to that of Leptocozlia, as shown in two authentic species (L. Jlabellites and L. Jimbriata), and the muscular impression of the ventral valve is quite like that of the same species. The exterior extremity of the cardinal process presents considerable variety of aspect, when a large number of individuals are examined. In some of them this part, if stripped of the external callosity of pseudo- deltidium, would have the main process bilobed, with a sinus a little below the apex, and an accessory lobe on each side similar to some of the species of Prodtjctus. The T. carinatus is the typical species o£ the genus. A western form has been described under the name T. occidens. The relations of the Genus Vitulina are not fully established. The shell-structure is punctate, with a papillose surface, a high area on the ven- tral v
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectscience, bookyear1853
