. 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. 164 [Senate species with S. congesta. The specimen from which the latter was described is a very symmetrical and rotund form, in which the depression on the mesial fold is scarcely marked ; while the surface has been in a slight de- gree worn and exfoliated, so that the little granules or bases of spines are nearly obliterated, leaving a striated surface, which is in some parts can- cellated by
. 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. 164 [Senate species with S. congesta. The specimen from which the latter was described is a very symmetrical and rotund form, in which the depression on the mesial fold is scarcely marked ; while the surface has been in a slight de- gree worn and exfoliated, so that the little granules or bases of spines are nearly obliterated, leaving a striated surface, which is in some parts can- cellated by concentric lines. The figures 1 and 1 a represent two views of a specimen having the granulations preserved upon the shell. Fig. 1 i is from a specimen with more extended hinge-line. Fig. 2 a and 2 h are views of the specimen designated S. congesta as above. These figures, reduced in size and beautifully executed, appear in Marcou's Explanatory Text, etc., pi. 3, f. 7, as S. Ae^erocZzYws, Defranc. It is scarcely necessary to say that this species has very little resemblance to S. heteroclitus. Spirifer medialis. DeUhyris medialis, Hall : Report, 4th Geol. Dist. 1843, p. 208, f. 8. The figure below is of the dorsal valve entire at the Spirifer medialis. Spirifer angusta (n. s.). Shell extremely transverse; lateral extremities very attenuated; hinge-line about four times as long as the width of the dorsal valve : dorsal valve with a simple, mesial fold, and about fourteen or fifteen simple narrow plications on each side; beak and cardinal margin incurved : ventral valve about two- thirds as wide as the dorsal valve, with a sharp w^ell defined. 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
