GONIOBASIS. 275 



Go7iiohasis LstahrooJcii. — Shell smooth, conical, rather thin, reddish 

 horn-color, without bunds ; spire attenuately conical, sharp-pointed ; 

 sutures impressed; whorls ten, somewhat convex; aperture rather 

 small, ovate, whitish within; outer lip acute, slightly sinuous; colu- 

 mella bent in. 



Operculum ovate, light brown, with the polar point to the left of 

 the centre, towards the basal margin. 



Habitat. — Knoxville, Tennessee; President Estabrook. 



Diameter, '34; length, -89 of an inch. 



Observations. — I received from President Estabrook nine specimens 



of this species. They were all covered with a black deposit of 



^ ^ Fig. 530. 



oxide of iron. This being removed, the epidermis was found 



to be smooth and shining, and of a reddish horn-color, in- 

 clining to yellow. It is very closely allied to Melania (Gonio- 

 basis) dubiosa (nobis), but differs in the aperture being slightly 

 more constricted and in being rather longer, having one more 

 whorl. It is also near to castanea (nobis), but is larger and 

 not chestnut-brown. The aperture is about one-third the length of 

 the shell. I dedicate this species to the late President Estabrook 

 of Knoxville, Tennessee. — Lea. 



176. G, interlineata, Anthony. 



Goniohasis interlinenttu, ANTHONY, Am. Jour. Concli., vol. i, p. 36, t.l, f. 3, Feb. 25, 

 18G5. 



Description. — Shell thin, elongate, slender, of a grayish horn-color, 



alternating with narrow, brown, hair-like lines, longitudinally and 



closely arranged; whorls 7-8, sul^convex, smooth ; sutures distinct; 



aperture small, elliptical, ashen gray within; columella regularly 



Fie 531 rounded, much curved at base, and with a faint indentation 



or notch where the outer lip meets it. 



Habitat. — Christy Creek, Indiana. 



Length of shell, -02 of an inch. Length of aperture, -25 ; 

 breadth of aperture, -15 of an inch. 



Observations. — A most beautifully delicate, slender spe- 

 cies, whose most prominent characteristic is indicated by its specific 

 name. Upon a light grayish horn-colored surface we find narrow, 

 brown, longitudinal lines, distinctly drawn. These are very conspic- 

 uous under the microscope, and appear to be slightly raised. It pre- 

 sents a general resemblance to G. data (nobis) and G. bicolorata 



