CHIEFLY OF THE UNITED STATES. 153 



Shell smooth, fusiform, thin, obtusely conical, purple or banded; spire obtusely 

 conical; sutures slightly impressed ; whorls about seven, scarcely convex ; aperture 

 large, rhomboidal, generally banded within ; outer lip acute, slightly notched in the 

 middle ; columella slightly thickened and twisted. 



Operculum ovate, light brown, rather thin, having several volutions, and with the 

 polar point well removed from the left margin. 

 Proc. Acad. Nat. Sci., 1864, p. 2. 



Hah. — Wabash River, Indiana, H. C. Grosvenor. 

 Diam. -27, Length -43 inch. 



Remarlis. — I have thirteen specimens of this remarkable shell. Eight of them 

 have a well defined though delicate notch on the edge, at or near to the periphery of 

 the last whorl. In some this notch is a little above the periphery, and in others a 

 little below. Five of the specimens have no notch, which probably arises in four of 

 them from not being full grown, and in one from having the thin delicate edge 

 broken off. The specimens vary in color, some being light horn-color with few or 

 many bands, others more or less purple and with or without bands ; others again 

 have obscure longitudinal thickenings, which being whitish give the specimens the 

 appearance of being folded. In all the specimens there is a light line under the 

 sutures, and some have six or seven brown bands which are distinctly seen on the 

 inside. The channel at the base is small but well defined. In outline this species 

 reminds one of Goniobasis Vauxiana, (nobis,) and Melania [Goniohasis) germana, 

 Anth. It is a thinner shell than either, and the notch in the lip removes it from 

 that genus. The aperture is about one-half the length of the shell. I have great 

 pleasure in naming this species after Mr. Grosvenor, to whom I am greatly indebted 

 for many of our Western Mollusca. 



Megaststropha Newberrti. pi. 23, fig. 68. 



Testa pallida- cornea, depresso-turrita, minutissime striata, superne et inferne acuto-carinata, late et pro- 

 fundite umbilicata ; anfractibus quinis, superne planulatis ; apertura magna, pallido-cornea, sub- 

 triangulari. 



Shell pale horn-color, slightly turrited, very finely striate, sharply carinate above 

 and below, widely and deeply umbilicate; whorls five, flattened above; aperture 

 large, pale horn-color and subtriangular. 



Planorhis Newherryi, Lea. Proc. Acad. Nat. Sci., 1858, p. 41. 



Hah. — Klamath Lake and Canoe Creek, California, J. S. Newberry, M. D. 

 My cabinet and cabinets of the Smithsonian Institution and Dr. Newberry. 

 Diam. -55, Length -42 inch. 



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