HELIX. 239 



GEOGRAPHICAL DISTRIBUTION. It seems to be quite 

 abundant in Florida, and is also common in Cuba. 



REMARKS. It would seem that Dr. Pfeiffer, who 

 established this species, afterwards concluded that it was 

 identical with H. arlorea. A comparison of numerous 

 specimens has led us to the contrary conclusion. The 

 shell is smaller, smoother, less delicate ; the whorls are 

 less rounded, less distinctly separated by the suture ; 

 and the periphery is decidedly angular ; the upper sur- 

 face is declivous, rather than discoidal ; and the base is 

 less openly umbilicated. In size it is more nearly like 

 //. electrina ; but it differs as above in all other re- 

 spects. [G.] 



68. HELIX CAPSEL.LA, GOULD. 

 PLATE XXIX. a. FIGURE 1. 



H. testa parva, discoidea, pellucida, nitida, electrina, um- 

 bilico infundibuliformi profundo perforata ; spira anfractibus 

 sex, minime convexis, striis remotis superne impressis ; su- 

 tura marginata ; apertura semilunari ; labro simplici, baud 

 incrassato. 



SYNONYMS AND EEFERENCES. 



Helix rotula, GOULD, Proc. Bost. Soc. Nat. Hist. III. 38, June, 1848. 

 DESCRIPTION. 



SHELL quite small, planorboid, pellucid, glistening, 

 amber-colored. Spire nearly plane, composed of about 

 six and a half, closely revolving, flattened whorls. Sur- 

 face with distant, impressed, radiating striae. Suture 



