94 HELIX-CEPOLIS. 



face very regularly, densely striate, the striation noticeably coarser 

 just behind the peristome ; spire low, convex ; apex polished, obtuse; 

 sutures impressed ; whorls 4 to 4, convex, the last wider, rounded 

 at the periphery, deeply deflexed anteriorly, and with a deep groove 

 or pit on the periphery a short distance behind the peristome ; aper- 

 ture quite oblique, rounded-lunate, white and showing the bands 

 within ; peristome broadly expanded, white, terminations somewhat 

 converging, lower margin reflexed, partly or wholly closing the 

 umbilicus, bearing within a tubercular tooth ; outer wall bearing a 

 callous fold a short distance within. Alt. 12-13, diam. 23 mill. 



Hayti. 



H. trizonalis GRAT. Act. Soc. Linn. Bord. xi, p. 401, t. 1, f. 8. 

 PFR. Monogr. i, p. 345 ; Conchyl. Cab. 474, 1. 158, f. 12-15. REEVE, 

 f. 592. 



Not an uncommon species. Pfeiffer mentions a pure white 

 variety. 



Var. TRIZONELLA Pilsbry. PL 49, figs. 65-67. 



Umbilicate ; smaller than the type ; very regularly obliquely 

 costulate, the costulse obsolescent around the umbilicus; aperture 

 small, rounded, the terminations of the narrowly-expanded peristome 

 joined by a white heavy parietal callus. Teeth as in H. trizonalis. 



Alt. 10, diam. 16 mill/ 



H. TRIZONALOIDES A. D. Brown. 



Imperforate, globose, thick, obliquely striated (pale horn color?), 

 encircled by three brown bands ; spire elevated ; whorls 5, rather 

 convex, the last furrowed behind the lip, forming a tubercle within; 

 aperture very oblique, ovate, with two teeth, one on the basal 

 margin, the other within the aperture ; peristome white, widely 

 reflected, covering the umbilicus. 



Alt. 21, diam. maj. 21, min. 17 mill. (Brown.) 



Hayti f 



Allied to H. trizonalis Grat., and also in the peculiar arrange- 

 ment of the teeth to H. cepa Mull. From the former it differs in 

 having the umbilicus entirely closed ; in the internal tubercle which 

 is stouter than in trizonalis ; in the more elevated spire ; and in 

 being heavier and more coarsely striated. From cepa it is readily 

 distinguished by its more elevated spire, smaller size and more 

 oblique aperture. I am in doubt as to the locality of this shell, but 



