HELIX. 103 



Helix minutalis MOKELET nee. Fer. Test. Nov. ii. p. 7. 

 Helix apex ADAMS, Contr. Conch, p. 36. 



EEEVE, 1. c. 339. 



Helix Lavelleana Orb. Moll. Cub. in textu, p. 161, excl. tab. (1853). 

 Helix Mauriniana Orb. 1. c. in tab. viii. figs. 20-22, excl. textu. 



Has been detected also in Michigan, Georgia, New 

 York, and in Washington Co. Texas (Moore). Is also 

 found in Cuba, Porto Rico, and Jamaica. 



In Mai. Blatt. ii. 93, Pfeiffer states that H. Lavelleana 

 is represented in the British Museum by poor specimens 

 of minuscula. I follow the same author in placing minu- 

 talis and apex in the synonymy. 



They are thus described. 



Helix apex. Shell discoidal ; whitish ; with microscopic spiral strias ; 

 spire scarcely elevated, convex ; apex very obtuse ; whorls 4, cylindri- 

 cal, with a deep suture ; aperture nearly circular ; lip thin and sharp ; 

 umbilicus very wide. 



Helix minutalis. T. perspective umbilicata, subdiscoidea, minute stria- 

 tula, corneo-albicans ; anfr. 4 convexiusculi, sutura impressa distincti ; 

 apertura vix obliqua, subcircularis ; peristoma simplex, marginibus ap- 

 proximatis. 



Hab. circa pagum Palizada provinciae Yucatenensis, necnon in insula 

 Cubana. 



HELIX ASTERISCUS MORSE. 

 PLATE LXXV1I. FIGURE 9. 



SYNONYMS AND REFERENCES. 



Helix astenscus MORSE, Proc. Bost. Soc. Nat. Hist., vi. p. 128, March, 1857. 



Animal short, bluish. 



Shell small, orbicular, very much depressed ; whorls four, 

 rounded above and below ; banded by twenty-five to thirty very 

 thin, transparent, and prominent ribs, very oblique, inclined back- 

 ward ; spire not rising above the last whorl ; suture deeply im- 

 pressed ; umbilicus moderately large, showing all the volutions ; 

 finely striated between the ribs ; in some specimens parallel lines 

 may be observed. Color light brown. 



Dimensions : breadth, T ^ in. ; height, 7^ in. 



