. 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. 84 [SXNATK. Rhynchonella barrandi. Rhynchonella principalis. Pal. Vol. iii, pi. 106, f. 4. Shfxl large, longitudinally ovate : dorsal valve unknown : ventral valve depressed-convex, forming a low elliptical arch from beak to front, most prominent along the middle, flattened or some- what concave near the lateral margins which are abruptly de- flected upwards towards the opposite valve; beak some
. 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. 84 [SXNATK. Rhynchonella barrandi. Rhynchonella principalis. Pal. Vol. iii, pi. 106, f. 4. Shfxl large, longitudinally ovate : dorsal valve unknown : ventral valve depressed-convex, forming a low elliptical arch from beak to front, most prominent along the middle, flattened or some- what concave near the lateral margins which are abruptly de- flected upwards towards the opposite valve; beak somewhat prominent and moderately incurved; front slightly concave, but not distinctly sinuate. Surface ornamented by about eighty regular rounded plications, which occasionally bifurcate, and are crossed by indistinct lines of growth. This species is closely related to R. barrandi; and having but a single ventral valve, I cannot readily decide how far it may differ in its entire characters. The casts of the preceding species are all proportionally broader when not compressed, have a more distinct sinus in front, and fewer plica- tions. With the knowledge at present possessed, this species may be con- sidered as holding a place intermediate between the very well-marked R. speciosa, and the equally well-marked R. barrandi. Geological position and Zocatoy.,Oriskany sandstone, Auburn ( ).. 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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