. The Conchologists' exchange. Mollusks. The Nautilus Vol. XXII. JANUARY, 1908. No. 0. POMATIOPSIS ROBUSTA N. SP. BY BRYANT WALKER. Shell ovate-conic, perforate, smooth and shining, lines of growth subobsolete; light greenish-yellow becoming lighter towards the apex ; spire elevated, apex blunt, the initial whorl being perceptibly flattened. Whorls 5^, convex, with a well impressed suture, body whorl large and inflated. Aperture ovate, narrow above and well rounded below, between one-third and one-half of the length of the shell; peritreme continuous and adnate to the parietal wall above the p
. The Conchologists' exchange. Mollusks. The Nautilus Vol. XXII. JANUARY, 1908. No. 0. POMATIOPSIS ROBUSTA N. SP. BY BRYANT WALKER. Shell ovate-conic, perforate, smooth and shining, lines of growth subobsolete; light greenish-yellow becoming lighter towards the apex ; spire elevated, apex blunt, the initial whorl being perceptibly flattened. Whorls 5^, convex, with a well impressed suture, body whorl large and inflated. Aperture ovate, narrow above and well rounded below, between one-third and one-half of the length of the shell; peritreme continuous and adnate to the parietal wall above the perforation ; lip sharp. Alt. 6, diam. 3^ mm. Jackson Lake, Wyoming. Type in the collection of A. A. Hinkley, Du Bois, 111. Although only a single specimen of this species was found, it is so obviously distinct from any of the known species of the genus, that I do not hesitate to describe it. It is a much stouter shell than P. hinkleyi and differs from both that and califomica in the less convex whorls and less impressed suture. In these particulars it resembles more P. lapidaria, but differs from that entirely in shape. The narrow perforation and sharp lip as well as the general contour easily separate it from P, 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 Averell, William D. Philadelphia, Wm. D. Averell
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectmollusks, bookyear188
