216 PROCEEDINGS OF THE ACADEMY OF 



Length 2 mill. 



Hah. Viti Isles. (Coll. Garrett.) 



A single specimen found with the two preceding species. 



?RissoA INPRATINCTA, Garr., pi, 2, fig. 22. 



Shell small, elongate, turreted, rather thin, sub-pellucid, shin- 

 uig, ash3'-white, with a brown tinge at the base ; spire long, acute ; 

 whorls 8, rounded, clathrate with longitudinal and smaller revolv- 

 ing ribs ; suture deeply impressed ; aperture small, sub-ovate, about 

 one-fourth the length of the shell ; peristome thin, with a slight 

 angle at its union with the arched columella. 



Length 2|- mill. 



Hah. Viti Isles, Samoa Isles. (Coll. Garrett.) 



A few examples occurred under stones near low-water mark. 

 The general aspect of the shell is like some of the small species 

 of Bittium. 



RissoA YENUSTA, Garr., pi. 2, fig. 23. 



Shell small, elongate-ovate, solid, vitreous, shining white ; whorls 

 7 ? convex, spirally ridged, ridges large, crenulate, compressed, Ave 

 on the body whorl, the upper two continued up the spire, the in- 

 terstices latticed with small compressed ribs ; suture deeply im- 

 pressed, margined ; aperture oval, slightl}* ol)lique, one-^third the 

 length of the shell ; peristome very thick, externally ribbed, mar- 

 gins united b}^ a callosity ; columella and parietal region arched. 



Length 3^ mill. 



Hah. Viti Isles. (Coll. Garrett). 



A very rare species, remarkable for the beauty of its sculpturing. 



VRissoA CRYSTALLiNA, Garr., pi. 2, fig. 24. 



Shell small, ovate, thin, sub-pellucid, vitreous, shining, white; 

 spire conical, obtuse ; whorls 5, convex, last one very large, 

 rounded, longitudinall}^ ribbed ; ribs small, slightly oblique, evanes- 

 cent on the lower part of the body whorl, the whole surfiice with 

 smaller spiral ridges; suture deeply impressed ; aperture sub-cir- 

 cular, vertical, slightly angulate above, a little more than a third 

 the length of the shell ; peristome thickened ; columella arched, 

 callous. 



Length 2 mill. 



Hah. Viti Isles. (Coll. Phil. Acad. Nat. Sciences.) 



A few examples picked up on the saudy beaches at Kiva Island. 



