. The American journal of science and arts . ched, as in most of the others. It is com-pletely petrified, heavy, and impregnated with iron. It bearscomparison with figures 33 and 34, plate 12, of a recent Chelonia,Cuvier, Ossem. Foss., edit. 1824; and with figures 11 and 19,plate 15, for a fossil specimen. In one remarkable respect, thisthigh bone differs from the same part of all recent or fossil spe-cimens, viz. on the exterior and anterior aspect of the shaft, pre-cisely where in other species the bone is smallest, it is here enlarg-ed by a strongly marked scabrous protuberance or exostosis
. The American journal of science and arts . ched, as in most of the others. It is com-pletely petrified, heavy, and impregnated with iron. It bearscomparison with figures 33 and 34, plate 12, of a recent Chelonia,Cuvier, Ossem. Foss., edit. 1824; and with figures 11 and 19,plate 15, for a fossil specimen. In one remarkable respect, thisthigh bone differs from the same part of all recent or fossil spe-cimens, viz. on the exterior and anterior aspect of the shaft, pre-cisely where in other species the bone is smallest, it is here enlarg-ed by a strongly marked scabrous protuberance or exostosis, forthe attachments of powerful muscles, vide Plate III, Fig. 2, (a):so that if this species was not larger than those at present exist-ing, it was probably proportionally stronger. The trochanter hasbeen broken off. Total length, 13 inches. Circumference at themiddle of the shaft, 9 inches. A portion of the shield of a Che-lonian occurred along with this bone. Philadelphia, May 15, AM. J(»Ol\. • :ns42. IiffJ ^ushixviakcvaiS^BatlanJJiaipnentt^t7ic left rmnns oflow& Z k-3 CliGlonia Cavc^eEi^iSaiiany ricflit ps fenwrts. a, scabrous protuberanee. Description of a Neiu Species of Thracia. 145 Art. XIII.—Description of a New Species of Thracia; by 0. , Prof. Ghem. and Nat. Hist. Middlebury College. Thracia ineq,ualis. T, testa fragili, per-inequilaterali, per-inequivalvi, irregulariterstriata, postice truncata; valva sinistra subplaniilata; altera per-convexa; callo nymphali cochleariformi, anteriiis elongate ; ossi-culo lunato, semicirculari. Shell white, very thin, before broadly and behind narrowlytruncate, very inequilateral and inequivalve, much deflected to theleft anteriorly; with the striae of growth unequal, numerous andcrowded at the extremities, where, under a magnifier, the surfaceappears shagreened by minute wrinkles of the striae ; epidermisvery thin, brownish, thicker at the extremities; left val
Size: 1206px × 2073px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bo, bookcentury1800, bookpublishernewhavensconverse, bookyear1820
