VITRINELLA. 101 



V. PURA, Garrett. PL 34, fig. 31. 



Moderately umbilicated, rather thin, smooth, shining, Avhite, with 

 faint microscopic growth-lines; w^horls 4, flatly convex, rapidly in- 

 creasing, the last large, rounded, slightly deflected in front, base 

 somewhat angular near the umbilicus, suture channeled, umbilicus 

 spirally grooved; peristome rather thick, nearly continuous. 



Diam. 2 mill. Viti Is. 



V. LiRiciNCTA, Garrett. PL 34, fig. 32. 



Widely umbilicated, hyaline, white, shining; whorls 4, convex, 

 rapidly increasing, the last encircled by from 9 to 11 ridges, most 

 crowded on the base, suture linear, lunbilicus spirally ridged ; peri- 

 stome nearly continuous. Diam. 1"5 mill. 



Viti Is. 

 V. ciELATA, Garrett. PL 34, fig. 33. 



Narr"owly uml)ilicated, vitreous, shining, subpellucid, white; 

 whorls 3i', angular, the last one trigonal, angles slightly carinate, 

 crossed by small closely-set, rounded, slightly flexuous ribs; peri- 

 stome thick, continuous. Diam. 2 mill. Viti Is. 



V. NODOSA, Garrett. PL 34, fig. 34. 



Umbilicus large, crenulated, shell discoidal, with flat spire; whorls 

 Si, convex, rapidly increasing, the last rounded, subtrigonal, trans- 

 versely nodose, crossed by crowded thin elevated stride; peristome 

 nearly continuous. Diam. 2 mill. Viti Is. 



V. PoNCELiANA, Foliu. PL 34, fig. 35. 



Moderately umbilicated, very minute, discoidal, thin, hyaline, 

 pellucid ; whorls 4, the last large, Avith thin spiral ridges, the inter- 

 stices radiately striate, suture subimpressed ; peristome simple, nearly 

 continuous. Diam. 2 mill. 



Bay of Panama. 

 V. PARVA, C. B. Adams. PL 34, fig. 36. 



Narrowly umbilicated, white, with numerous stout, prominent 

 transverse ribs; whorls 3l', the last very large with a spiral ridge 

 above and another below the periphery; aperture very oblique, lip 

 slightly thickened. Diam. 1"2 mill. 



Panama— Mazatlan. 



V. dathrata, Carp, is a synonym. 



