. 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. 72 [Senate Rhynchonella altiplicata. '^ Pal. , pi. 33, Shell snbtrigonal, more or less gibbous : ventral valve depressed- convex J beak pointed, arched or nearly straight : dorsal valve the larger, most elevated in the middle, declining with a curved outline towards the beak and margins; beak incurved ; foramen triangular, extending to the apex of the beak. Surface marked by fr
. 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. 72 [Senate Rhynchonella altiplicata. '^ Pal. , pi. 33, Shell snbtrigonal, more or less gibbous : ventral valve depressed- convex J beak pointed, arched or nearly straight : dorsal valve the larger, most elevated in the middle, declining with a curved outline towards the beak and margins; beak incurved ; foramen triangular, extending to the apex of the beak. Surface marked by from ten to about nineteen simple, strongly elevated, sharply angular plications on each valve; two to four of which are elevated on the dorsal valve into a more or less distinct mesial prominence extending nearly to the beak, and from one to three depressed on the middle of the ventral valve into a distinct sinus, which widens regularly and somewhat rapidly from near s the beak to the front, where it is prolonged into a short projec- ;. tion, filling a corresponding sinus in the front of the opposite valve : shell traversed by fine concentric lines of growth. ' Along the lateral slopes of the cardinal margin, on each side of the beaks, there is generally an oval space of greater or less extent, not plicated. This, although sometimes slightly concave, is never so distinctly impressed as often in species of the type of R. vjilsoni. Geological position and locality. Shaly limestone of the Lower Hel- derberg group, Albany and Schoharie 1, 2, 3, 4 : R. ALTIPLICATA. 6, 6 : R. tbansvkrsa. 7 : R. acutiplicata». 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 New York State Museum. Albany, Regents of the University of the State of New York
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectscience, bookyear1853
