228 PROCEEDINGS OF THE ACADEMY OP 



be compared with 0. aciculina, Sowr., from New Caledonia. As 

 compared with the description and figure our shell is longer, more 

 slender, the spire more plain in outline, the base less produced, 

 and has one line less. 



Odostomia cuspid at a, Garr., pi. 3, fig. 54. 



Shell elongate, subulate, slender, smooth, shining, creamy-white, 

 with a microscopical articulate darker line on the middle of the 

 whorls; spire very long, cylindrically tapering, apex obtuse; 

 whorls 13-15, plano-convex, the last one stout, rounded, rudely 

 striated by lines of growth ; suture deeply impressed ; aperture 

 broadly ovate, angulate above, about one-seventh the length of the 

 shell ; deep in the throat maj' be seen several revolving fine lamellae ; 

 peristome thin, slightlj'^ expanded at the base ; columella callous, 

 reflexed so as to form a slight umbilical fissure, and the spiral fold 

 stout. 



Length 11 mill. 



Hab. Yiti Isles. (Coll. Garrett.) 



We found three perfect examples of tliis fine species on weedj'' 

 ground in the middle region of the littoral zone. 



Genus RISSOPSIS, Garr. 



Shell small, thin, elongate, C3dindrical; apex truncate ; aperture 

 sub-ovate, angular above, entire ; peristome rather thin, somewhat 

 expanded ; columella oblique, arched. 



Rissopsis TYPiCA, Garr. pi, 3, fig. 55. 



Shell small, elongate,' slender, thin, h3'aline, glossy, smooth, 

 white ; spire long, cylindrical, slightly tapering, sides nearly plain, 

 apex truncate ; whorls G, flat ; suture faintl}' impressed, margined ; 

 aperture vertical, ovate-triangular, nearl}' one-third the length of 

 the shell; peristome rather thin, sinuous, somewhat expanded; 

 columella oljliquelj^ arched, slightly callous. 



Length 10 mill. 



Ilab. Yiti and Samoa Isles. (Coll. Garrett.) 



We found three specimens of this delicate transparent shell on 

 the outer reefs. 



Obeliscds hyalinus, Garr. pi. 3, fig. 56. 



Shell small, elongate-oblong, sub-cylindrical, thin, smooth, hya- 

 line, white; spire long, turreted, the upper whorls tapering more 



