56 HELICEA. 



DESCRIPTION. 



Animal not observed. 



Shell with a narrow, or partially covered umbilicus, 

 depressed, rather thin, closely striated, rather transparent 

 and smooth, horn-colored ; spire slightly elevated ; suture 

 lightly impressed ; whorls 5, rather convex, increasing 

 slowly, the last one subcarinate at its periphery, scarcely 

 descending ; aperture lunar, oblique, generally slightly 

 contracted by a parietal denticle which obliquely enters 

 the mouth of the shell ; peristome white, thickened, the 

 upper portion hardly expanded, reflected below, and at 

 the columellar junction spreading into a thin, partial cov- 

 ering to the umbilicus. 



Greater diameter 21, lesser 18, height 10 mill. 



Geographical Distribution. New Brauenfels, Texas, 

 (Pfeiffer), Washington Co. (Moore). 



Remarks. This species is confounded by Pfeiffer with 

 H. dentifera, an authentic specimen of which he has not 

 seen. It is quite a distinct species and inhabits a distinct 

 geographical region. It may be distinguished from den- 

 tifera most readily by attention to the following particu- 

 lars. Its umbilicus is generally but partially covered, 

 while dentifera is always imperforate, its color is lighter, 

 its surface smoother, and above all, its lip is not so broadly 

 reflected ; it is also distinctly subcarinate at the periphery. 



The shell is described as " tenuis," and so appears in the 

 figure in Chemnitz. I have specimens quite solid. This 

 figure is erroneously referred to dentifera^ under which 

 name Pfeiffer in the third volume of his Monograph and 

 in Chemnitz describes Roemeri. 



HELIX PAL.LIATA SAY vol. ii. p. 136, pi. 



Hdix palliata SAY, (Binney's ed.j p. 16. 



DEKAY, N. Y. Moll. 33, pi. iii. fig. 36, (Excl. a. b.) 

 CHEMNITZ, ed. 2, i. 359, pi. Ixii. figs. 15, 16, (1849). 

 PFEIFFEK, Mon. Hel. Viv. i. 316; iii. 267. 



