122 HELIX-CARACOLUS. 



arcuate ; terminations of lip distant, joined by a shining white 

 callus, which shows a short distance within, under a lens, a pecul- 

 iarly elongated, wrinkle-like dense granulation, coarser than in any 

 of the preceding species of Caracolus. 

 Alt. 30-31, diam. 57-63 mill. 



Hayti. 



H. sarcocheila MORCH, Cat. Kierulf., p. 28, t. 1, f. 1. PFR., 

 Zeitschr. f. Mai. 1852, p. 132; Conchy!. Cab. p. 494, t. 161, f. 13; 

 Monogr. iii, p. 165. 



Separated from the other species by the coarser granulation of the 

 parietal wall. The species is otherwise closely allied to H. insititia. 

 See remarks on page 119. 



H. ANGISTOMA Ferussac. PI. 21, figs. 8-10. 



Imperforate, depressed, acutely carinated, solid, brown, with more 

 or less distinct darker bands above and below the carina ; surface 

 obliquely delicately striate, decussated by spiral lines (under a lens) ; 

 spire low-conoidal ; apex planulate ; suture linear ; whorls about 6, 

 flat, very gradually increasing, the outer three equal in width ; last 

 whorl not descending anteriorly, convex beneath, not indented in 

 the center ; aperture small, narrow, transverse-subtriangular, oblique; 

 peristome considerably thickened, especially below, slightly ex- 

 panded, white or brown, the terminations distant, joined by a heavy 

 parietal deposit of callus. Alt. 17-20, diam. 42-43 mill. 



Hayti. 



H. angistoma FER., Hist, t. 60, f. 1. PFR,, Conchyl. Cab. p. 62, 

 (t. 8, f. 9 ?) ; Monogr. i, p. 21. REEVE, f. 206. (H. " angystoma" 

 Desh.) Caracolla angistoma LAM. An. s. Vert, iii, p. 96. (H. 

 " anchistoma " Mart.) 



A more distinct form than either of the preceding ; distinguished 

 by the narrow subequal whorls, narrow aperture, even more con- 

 tracted than in H. excellens. It is a rather rare form. 



H. MARGINELLA Gmelin. PI. 22 and 23 ; pi. 55, figs. 1-3, 6-11. 



Umbilicate or imperforate ; conoidal or flattened-conoidai ; some- 

 what shining ; solid ; surface striate or decussated ; apex white or 

 corneous, planulate ; whorls 5, last whorl acutely carinated, a little 

 descending anteriorly ; aperture very oblique, transverse triangular- 

 oval ; peristome somewhat expanded all around, white or brown ; 

 color yellowish, with well-defined contrasting dark zones. 



