HELIX CORYDA. 47 



one of them entirely Avhite, without bands. The species belongs in 

 the group Cory da Alb. of which heretofore no Haytien species has 

 been made known to us. It gives the impression of a snail living in 

 quite dry situations. The fine brown dots and the bands remind 

 one ol H. ovumreguli of Cuba., which is the same group, but is much 

 larger, smoother, and is also separated by the more elongated, par- 

 allel margins of its nearly horizontal peristome. 

 H. NIGROPICTA Arango. 



Imperforate, depressed, solid, obliquely, arcuately costulate striate 

 smoky-brownish, ornamented with black interrupted bands; spire 

 short convex-conoidal, apex glabrous ; whorls 4|, moderately con- 

 vex, regularly increasing, the last sub-depressed, shortly deflexed 

 anteriorly ; aperture very oblique, lunate-oval, shining within, vio- 

 laceous ; peristome labiate with lilac, margins scarcely converging, 

 right lip briefly expanded, basal reflexed, at the insertion dilated, 

 flat, adnate. 



Alt. 10, diam. maj. 19 min. 15* mill. ( Pfr.) 



Sagua de Tanamo, Cuba. 



H. nigropicta ARANGO, in PFR. Malak. Blat. xiii, 1866, p. 57 ; 

 Monographia v, p. 304. ARANGO, Fauna Mai. Cubana, p. 73. 



Known to me only by the above description. 

 H. GAUSSOINI Tryon. PL 14, fig. 92. 



See appendix. 



Globosely depressed, smooth, rather thick ; spire depressed-coni- 

 cal, apex obtuse, suture moderately impressed ; w^horls 5*, convex, 

 increasing slowly, not deflected at the aperture ; aperture small, 

 semi-lunar, labrum sharp, not reflected, but much thickened at the 

 base, and terminating at the center of the base of the shell, where it 

 is considerably impressed and dilated, covering the umbilicus; white, 

 the spire a faint flesh color, ( denuded of epidermis ). 



Alt. 6, diam. 9 mill. ( Tryon.) 



Island of Navassa. 



H. gaussoini TRYON, Am. Jour. Conch. 1866, p. 304, t. 20, f. 1. 

 PFR. Monogr. vii, p. 270. 



Tryon says: It is somewhat related to the Cuban group to which H. 

 melanocephala etc., pertain. The minute island of Navassa is a 

 mere speck upon the ocean, over a hundred miles south of the east- 

 ern extremity of Cuba, nearly as far east of Jamaica, lying between 

 it and Hayti, about fifty miles west of the latter. 



