. 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. No. 109.] 93 It is closely related to Terehratula comprcssa ( Murchison), but at- tains a larger size than any of ttat species figured, and is almost always more gibbous, especially the ventral valve near the beak. A single specimen, apparently of this species ( pi. 40, f. 2 c, d, e & f), is much more compressed than the others, and less distinctly sinuate on the middle of the valves, and c
. 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. No. 109.] 93 It is closely related to Terehratula comprcssa ( Murchison), but at- tains a larger size than any of ttat species figured, and is almost always more gibbous, especially the ventral valve near the beak. A single specimen, apparently of this species ( pi. 40, f. 2 c, d, e & f), is much more compressed than the others, and less distinctly sinuate on the middle of the valves, and consequently nearly destitute of the emargination in the front : this, however, is only a single exception to the general cha- racters of the species. Geological position and locality. Shaly limestone of the Lower Helder- berg group, Albany MeRISTA BELLA. MeRISTA SUBQUADRATA (). Pal. , pi. 40, f. 3. Shell subquadrate : ventral valve the larger, gibbous in the middle and umbonial region; beak prominent, incurved, ap- parently not perforate : dorsal valve depressed-convex ; front slightly elevated, forming a small undefined mesial prominence immediately on the margin; beak well defined, incurved. Sur- face smooth, or marked with many indistinct concentric lines of growth. The most marked characters of this species are its obliquely subquadrate form, and the slight elevation of the front margin of the dorsal valve, with- out any traces of a corresponding sinus in the opposite valve. Geological position and locality. Shaly limestone of the Lower Helder- berg group, Albany 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
