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; Conchyl. 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 Fe*russac. 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-couoidal ; 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. (JT. "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. excellent It is a rather rare form. 



H. MARGINELLA Ginelin. 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. 



