70 HELIX-PARTHENA. 



separated by linear sutures, at the periphery acutely carinated ; base 

 convex, turgid ; aperture large, oblique ; peristome narrowly reflex- 

 ed, upper and outer margins curved, angulated or rounded at the 

 position of the carina ; basal margin arcuate, adnate to the base at 

 the umbilical region. Alt. 27, diam. maj. 43, min. 36 mill. 



Porto Rico. 



H. obliterate FEE., Hist. t. 61. f. 3, and Prodr., p. 136. PFR., in 

 Conchyl. Cab., t. 67. f. 3. REEVE, Conch. Icon., f. 231. 



Allied to the preceding species, but more coarsely granulose, less 

 acutely carinated and more convex above. 



H. ANGUSTATA Ferussac. PI. 7, figs. (57, 68. 



Imperforate, depressed, carinated, nearly equally convex below 

 and above the carina, rather solid, light corneous or yellowish, 

 closely spirally marked with minutely undulating chestnut lines, 

 lighter beneath ; under a lens seen to be very minutely granulate on 

 the inner whorls, the outer whorl near the carina above and below 

 densely indented or pitted; spire convex, obtuse; whorls 3J to 4, 

 rapidly widening, the penultimate nearly as wide as the last 

 whorl ; body-whorl compressed in front, but becoming turgid on its 

 latter half, carinated, a trifle deflected toward the aperture ; aperture 

 very oblique, truncate-oval ; peristome well reflexed, somewhat thick- 

 ened, upper and lower margins slightly curved, outer lip arcuate ; 

 baso-columellar margin wide, thickened within, especially toward its 

 insertion. Alt. 18, diam. maj. 30, min. 25 mill. 



Haijti. 



H. angustata FER., Hist., t. 61, f. 1, and Prodr. 133. PFR., Symb. 

 iii, p. 74; Monogr. i, p. 299.; Conchyl. Cab. t. 112, f. 1, 2. REEVE, 

 Conch. Icon. f. 216. 



This form is related to the following species in its oblique aperture, 

 solidity, coloration and rugose or malleated sculpture at the periph- 

 ery ; from them it may be separated by the more depressed form and 

 carination 



H. DOMINICENSIS Pfeiffer. PI. 17, figs. 50, 51. 



Imperforate, globose-depressed, thin or moderately solid, cuticle 

 thin, straw-colored, encircled at the periphery by a narrow chestnut 

 band, and frequently with numerous lines and bands of white whence 

 the cuticle has been removed ; surface lightly obliquely striate, and 

 densely obliquely malleate, especially upon the penultimate 



