72 HELIX-PARTHENA. 



tinged with brownish, sometimes with a narrow, faint peripheral 

 fascia ; obliquely marked with incremental wrinkles ; sutures a little 

 more impressed than usual in H. dominicensis ; whorls 4, shaped as 

 in H. dominicensis ; aperture wide-lunar, oblique, peristome well 

 reflexed, basal margin wide, slightly concave. 



Alt. 27, diam. maj. 40, min. 32 mill. ; alt. 22, diam. maj. 31, min. 

 25 mill. 



The last-described form agrees with H. dominicensis in form, 

 coloration (except that the peripheral fascia is fainter), in the 

 excessively minute granulation of the whole surface, seen only under 

 a strong lens, and in the characters of the aperture. It differs from 

 that species in lacking the conspicuous malleation of the surface, 

 which in dissita is smooth or only very obsoletely malleated, and it 

 shows no traces of zones denuded of cuticle. 



H. UNDULATA Ferussac. PL 6, figs. 53, 54. 



Imperforate, globose, rather thin, straw T -colored, encircled by very 

 numerous, dense, minutely undulating or zigzag -chestnut lines ; ob- 

 liquely striate ; spire short, rather conoidal, apex obtuse, white ; 

 inner whorls densely microscopically granulated; whorls 4-5, 

 moderately convex, separated by impressed sutures, the last globose, 

 a trifle descending anteriorly ; aperture large, rotund-lunar, bluish 

 within ; peristome narrowly expanded, thickened, outer lip arcuate, 

 upper and columellar margins a little curved, the latter dilated and 

 adnate at the umbilical region. 



Alt. 42, diam. maj. 44, min. 37 mill ; alt. 28, diam. 30 mill ; alt. 

 50, diam. 50 mill. 



Hayti. 



H. undulata FER., Prodr., 25, Hist. 1. 16, f. 3-6. PFR. in Conchyl. 

 Cab., t. 5, f. 3, 4. REEVE, Conch. Icon., f. 212. H. lineolata LAM. 

 An. s. Vert, vi, p. 67. IT. crispata FER., Prodr. 26, Hist. t. 25, 

 f. 7, 8. PFR. Symb., iii, p. 65 ; Monogr. i, p. 23 ; Conchyl. Cab. p. 

 225, t. 28, f. 1, 2. REEVE, f. 217. 



The shell is much more globose than that of H. dominicensis and 

 H. dissita, and is more or less densely lineolate with brown. The 

 peristome is narrower than in either of the species named, and the 

 whorls more numerous. The measurements given above show the 

 great variation in size to which the species is subject. H. crispata 

 Fer. does not seem to have sufficiently tangible or stable characters 

 to be retained as a separate variety. (PI. 7, figs. 65, 66.) 



