102 VITRIXKLLA. 



V. DKcrssATA, Cpr. PI. 34, fig. 37. 



Moderately umbilicated, turbiniform, thin, porcellanous, white; 

 whorls 4*, rounded, the last with about 15 spiral ridges, decussated 

 by more or less distant radiating striae; peristome continuous in the 

 adult. Diam. 1 mill. Mazatlan. 



\. MONILE, Carp. PI. 34. fig. 38. 



Narrowly umbilicated, subelevated, lieliciform, diaphanous, white; 

 whorls 4], very minutely decussately striate on the last whorl, the 

 spiral lines being about twenty in number; peristome continuous, 

 sinuous as in lanthina. Diam. 1/3 mill. Mazatlan, 



The decussating sculpture enters the umbilicus; the interstitial 

 spaces are suboval, punctate, appearing (in a favorable light) like 

 rows of pearl necklaces. 

 V. SUBQUADRATA, Carp. PL 34, fig. 39. 



Widely umbilicated, subhyaline white, smooth, shining, discoidal 

 planate, whorls 4, sometimes striate at the suture, the last whorl 

 subangulated near the umbilicus and below the periphery ; aperture 

 subquadrate, lip sinuated at the suture and in the middle. 



Diam. 1 mill. Mazatlan. 



V. HELICOIDEA, C. B. Ad. PI. 34, figs. 40, 41. 



Widely umbilicated, discoidal, white, opaque or translucent, with 

 an impressed sutural line, and transverse unequal stride, spire convex, 

 scarcely elevated ; whorls 4, subconvex, the suture scarcely impressed; 

 peristome subthickened ; umbilicus defined by a spiral angle. 



Diam. 1/87 mill. Jamaica. 



V. STRIATA, d'Orb. PI. 34, figs. 42, 43. 



Narrowly umbilicated, translucent, whitish, spirally striate; aper- 

 ture oblique, peristome slightly thickened, slightly sinuous; pe- 

 riphery subaugulated. Diam. 1 mill. Cuba. 



V. AXOMALA, d'Orb. PI. 34, figs. 44, 45. 



Umbilicated, subdiscoidal, translucent, smooth, whitish; whorls 5, 

 flatly convex, periphery subangulated ; peristome slightly thickened. 



Diam. 2 mill. Cuba. 



Unfigured Species. 



Neither Adams nor Carpenter figured any of the numerous species 

 described by them. I have been able to illustrate a few of the 

 species of both authors, by drawings from authentic specimens; many 



