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, t, 158, f. 12-15. REEVE, 

 f. 592. 



Not an uncommon species. Pfeiflfer 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, miu. 17 mill. (Broicn.) 



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 



