NATURAL SCIENCES OP PHILADELPHIA. 227 



lines and transverse impressed strioe ; suture linear, margined; 

 aperture broad 1}^ ovate, vertical, acutely angular above, nearlj- a 

 fourth the length of the shell ; peristome sharp, slightly sinuous ; 

 columella thinly callous, slightly concave, somewhat reflexed, and 

 the plait rather small. 



Length fi^ mill, 



Hab. Yiti Isles. (Coll. Garrett.) 



"We found three examples of this thin, hyaline species on weedy 

 ground in the lower i*egion of the littoral zone. 



Odostomia vitkea, Garr., pi. 3, fig. 52. 



Shell elongate, subulate, thin, vitreous, smooth, shining, pellucid, 

 white; spire ver}^ long, regularly tapering from the body whorl, 

 apex acute, base slightl}' produced, whorls 11, nearly plain ; last 

 one rounded, faintly striated hy lines of growth ; suture linear 

 and rather widely margined beneath ; aperture, ovate, acutely 

 angular above, with revolving thin lamellae deep in the throat, 

 which, as seen through the transparent shell appear like revolving 

 lines; peristome thin, straight, slightly expanded at the base; 

 columella concave, callous, slightly reflexed, forming a small um- 

 bilical fissure, and the spiral fold stout ; parietal region thinly cal- 

 lous. 



Length H mill. 



JHab. Yiti Isles. (Coll. Garrett.) 



Onl}'' a solitary specimen found ; but quite distinct from 0. 

 obeliscus, Nob., which it resembles. The latter has no internal 

 spiral lamellae, and is impressly striated transversely. 



Odostomia unilineata, Garr., pi. 3, fig. 53. 



Shell slender, elongate, .subulate, smooth, shining, sub-pellucid, 

 white, with a revolving yellowish-browu line just above the suture ; 

 spire very long, c^'lindrically tapering ; whorls 10-11 ? (apex frac- 

 tured ; whorls remaining 9) plano-convex, last one slightly pro- 

 duced at the base, under the lens rudely striated with lines of 

 growth; suture deeply imjjressed; aperture oblique, ovate, acutely 

 angular above, lyrate within, lyrje very delicate, several in number, 

 revolving in the interior of the shell ; peristome thin, simple ; co- 

 lumella concave, slightly reflexed, and the revolving fold stout. 



Length 10^ mill. 



Hab. Yiti Isles. (Coll. Garrett.) 



Only a single example of this fine species was found. It may 



