NATURAL SCIENCES OF PHILADELPHIA. 213 



RiSSOINA TUURITA, GaiT., pi. 2, fig. 13. 



Shell oblong-ovate, solid, white, spire moderately elevated, 

 turretcd ; whorls 10, plain, irregularl}- increasing, all except the 

 body strongly tabulate, the angle sharp, and excepting the three 

 last whorls, strongly ribbed longitudinally ; ribs rounded, the 

 same width as their interstices, and the whole surface with small 

 close spiral elevated lines and grooves ; aperture oblique, ovate, 

 about one-third the length of the shell ; peristome thick, slightly* 

 expanded, crenulate within; columella and parietal region with a 

 rather thick deposit of callus. 



Length 7 mill. 



Hah. Societ}' Isles. (Coll. Garrett.) 



A very rare species found under clumps of coral on the outer 

 reefs. 



ViTRiNELLA PURA, Garr. , pi. 3, fig. 13. 



Shell small, depressed orbicular, rather thin, smooth, shining 

 white, with faint microscopical radiating lines of growth ; spire 

 depressly conoid ; whorls 4, flatly convex, rapidly and regulai'ly 

 increasing, last one large, rounded, slightly deflected in front, and 

 somewhat angular near the umbilicus; suture channelled ; umbili- 

 cus deep funnel-shaped, spirally' grooved, nearl}' one-third the 

 greatest diameter of the shell; aperture circular, oblique ; peri- 

 stome rather thick, nearly continuous. 



Diam. Greatest 2, height 1 mill. 



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



We found about thirty examples of this species in beach sand 

 at Kiva Island. It is probably the first species recorded from the 

 South Sea Islands. 



ViTRiNELLA LiRiciNCTA, Garr., pi. 3, fig. 14. 



Shell small, depressed orbicular, shining, hyaline, white, spire 

 but little elevated ; whorls 4, convex, regularly and rapidly in- 

 creasing, last one large, rounded, girdled with 9-11 ridges, which 

 are most crowded beneath and remote above ; suture linear; um- 

 bilicus large, deep, perspective, freely showing the whorls, spirally 

 ridged a little more than a third the greatest diameter of the shell ; 

 aperture circular, diagonal ; peristome nearly continuous. 



Diam. Greatest H, height | mill. 



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



