98 HELIX. 



H. FUSCULA, Adams. PI. 19, fig. 24. 



Narrowly umbilicated, striulate, scarcely shining, fuscous ; whorls 

 4, convex, the last somewhat narrow, not descending. Diam. 3 mill. 



Jamaica. 



H. VORTEX, Pfr. PI. 19, figs. 25-28. 



Narrowly umbilicated, hyaline, obsoletely striated ; whorls 5, a 

 little convex, narrow, the last subangulate, sometimes a little 

 deviating. Diam. 6 mill. 

 Cuba, St. Croix, Jamaica, Porto Rico, Bermuda, Barbados, Florida. 



Gould described it from the last locality as H. selenina; it is also 

 H. otellina, Riise, MSB., and H. bracteola, Fer. (fig. 28), from 

 Martinique, may probably be added, as indicated by Bland. 



H. ALVEUS, Adams. PI. 19, fig. 29. 



Rather narrowly umbilicated, with very slight, unequal, incre- 

 mental striae, translucent, whitish, suture deep ; last whorl narrow, 

 periphery obsoletely angulated. Diam. 7'5 mill. 



Jamaica. 



H. PERAFFINIS, Adams. PI. 19, fig. 30. 



Umbilicated, striulate, hyaline; whorls 6, convex, the last 

 rounded, base flatter. Diam. 8 mill. 



Jamaica. 



Adams considered it intermediate between H. Boothiana and H. 

 vortex. 



H. SUBAQUILA, Shuttl. PI. 19, fig. 31. 



Narrowly umbilicated, very slightly striulate, light corneous or 

 whitish, a little shining ; whorls 4, gradually increasing, convex, 

 the last rounded-inflated, suture deep. Diam. 5'5 mill. 



Porto Rico, Vieque, St. Thomas. 



With fewer whorls than H. peraffinis, and wider umbilicus than 

 JET. Boothiana, the spire more depressed than in either. 



H. SPRETA, Adams. PI. 19, fig. 32. 



Umbilicus rather narrow, light corneous, translucent, smooth ; 

 whorls 5, convex, shouldered, suture rather deep, last whorl 

 rounded. Diam. 6.25 mill. 



Jamaica. 



Var. ERRANS, Adams. 



Whorls less shouldered, umbilical region somewhat thickened, 

 opaque. 



