NATURAL SCIENCES OF PHILADELPHIA. 217 



?T?rssoA HTALINA, Garr., pi. 3, fig. 25. 



Shell elongate-oblong, sub-cylindrical, thin, hyaline, shining 

 white ; spire long, obtuse ; whorls 6-7, convex, with very fine 

 crowded revolving raised striiie, crossed by more delicate lines of 

 growth ; suture deeply impressed ; aperture roundlj'^-ovate, vertical, 

 one-third the length of the sliell; peristome rather thick, slightly 

 expanded at the base, margins united b^'^ a callosity ; columella 

 arched. 



Length 6 mill. 



Hab. Samoa, Yiti, and Paumotus Isles. (Coll. Phil. Acad. Nat. 

 Sciences.) 



A very rare and beautiful species of which we found eight exam- 

 ples at the above groups of islands. 



RissoA TRUNCATA, Garr., pi. 3, fig. 36. 



Shell small, oblong, thin, cjdindrical, pellucid, shining, white; 

 spire moderately long, apex truncate ; whorls 5, convex, the three 

 last of nearly equal width, with fine crowded raised revolving striae ; 

 suture deeply impressed ; aperture roundlj'-ovate, vertical, little 

 less than one-third the length of the shell; peristome thick, slightly 

 expanded, margins united by a callosity ; columella arched. 



Length 2 mill. 



Hah. Viti Isles. (Coll. Garrett.) 



We found five examples of this species in beach sand at Kiva 

 Island. It is closel}^ allied to the preceding species, but differs in 

 size, coarser strise, more truncate apex, and less tapering spire. 



VoLVARiA (VoLVARiNA) PTGM.EA, Garr., pi. 3, fig. 27. 



Shell very small, ovate, smooth, glossy, white ; spire depressly 

 conoid ; aperture narrow, linear ; peristome abbreviately lyrate 

 within, and slightly everted towards the base ; columella with 4-5 

 plaits. 



Length 2^ mill. 



Hab. Yiti Isles. (Coll. Phil. Acad. Nat. Sciences.) 



Not uncommon in the condition of beach-worn specimens. 



Drillia vidualoides, Garr., pi. 2, fig. 38. 



Shell sub-claviform, solid, spire long, acute, ashy-white, lower 



half of the last whorl chestnut-brown ; whorls 7-8, concave beneatli 



the suture, girdled with a revolving vow of large oblong nodules, 



about eight on each whorl ; aperture oval, varied with white and 



15 



