CHIEFLY OF THE UNITED STATES. 331 



EemarJcs.— This species belongs to a group of which flavescens (nobis) may be 

 considered the type. It differs in being a smaller species, having a less elevated 

 spire, having a less recurved columella at base, in having finer and closer transverse 

 striae and in having an aperture of purple within, with an edging of white. The 

 strijB on the specimen before me are fifteen in number, and being strongly developed, 

 form rather deep intermediate grooves. The aperture is about one-half the length 

 of the shell. 



GONIOBASIS BIFASCIATA. PL 54, fig. 7. 



Testa plicata, aliquando striata, subcrassa, luteola, bifasciata; spira obtusa, valde plicata ; suturis 



irregulariter impressis : anfractibus instar senis, planulatis ; apertura parviuscula, subrotunda, 



intus albida ; labro acuto, parum sinuoso ; columella albida et contorta. 



Shell plicate, sometimes striate, somewhat thick, yellowish, double banded; spire 



obtuse, much plicate; sutures irregularly impressed; whorls about six, flattened; 



aperture rather small, subrotund, whitish within; outer lip acute, somewhat sinuous; 



columella whitish and twisted. 



Proc. Acad. Nat. Sci., 1868, p. 151. 

 Bab. — Jackson County, Alabama, Dr. Spillman. 

 My cabinet and cabinet of Dr. Spillman. 



^''^"- -25. Length -54 inch. 



Remarhs.—T\ns pretty little species, if we may judge of the three specimens before 

 me, is very persistent in its characters. The two wide bands and the yellow epider- 

 mis, with the strong folds, seem to distinguish it well from other species. There are 

 about eleven rather strong ribs on each whorl. It is somewhat like formosa, Con., 

 but it differs from the figure and description in not "having two proximate, promi- 

 nent lines on the summit of each whorl." He does not mention the bands, but his 

 figure gives one. The aperture is full one-fourth the length of the shell. 



GONIOBASIS • CLATHRATA. PI, 54, fig. 8. 



Testa plicata et striata, pyramidata, tenui, dilute cornea, efaseiata; spira exserta, acuminata; suturis 

 imiwessis; anfractibus octonis, convexiusculis ; apertura parviuscula, rhomboidea, intus vel albida 

 vel purpurea ; labro crenulato, subsinuoso ; columella valde contorta. 

 Shell plicate and striate, pyramidal, thin, pale horn color, without bands ; spire 

 exserted, pointed ; sutures impressed ; whorls eight, a little convex; aperture rather 

 small, rhomboidal, purple or white within ; outer lip crenulate, subsinuous ; colu- 

 mella very much twisted. 



Proc. Acad. Nat. Sci., 1868, p. 151. 

 SctS.— Jackson County, Alabama, Dr. Spillman. 

 My cabinet and cabinet of Dr. Spillman. 



77 



