HELIX-DENTELLARIA. 91 



pressed, entering tooth, marked outside by a corresponding furrow 

 or groove, and a smaller compressed tooth nearer the insertion. 

 Baso-columellar lip reflexed over the umbilicus, nearly or wholly 

 covering it; ends of peristome remote, joined by a parietal ridge of 

 callus. Alt. 12, diam. 20 mill.; alt. 10, diam. 16 mill. 



Martinique ; Guadeloupe. 



H. pachygastra GRAY, P. Z. S. 1834, p. 68. PFR. in ConchyL 

 Cab. p. 77, t. 10, f. 3, 4 ; Monogr. i, p. 309. REEVE f. 270. H. 

 fuligineq var. fuscoviridis GRAT. Actes Soc. Linn. Bord. xi, p. 403, 

 t. 1, f, 15. H. dolata Fe>. PFR. Symb. i, p. 37, and of DESK. 

 Dentellaria pachygastra Fer. BINNEY, Ann. Lye. N. H. of N. Y. iii, 

 1884, p. Ill, t. 16, f. P and t. 9, f. F (Jaw and dentition.) 



By the often partly open umbilicus and the shape of the aperture, 

 this species leads toward H. auridens. 



The globose body-whorl and smooth surface separate H. pachygastra 

 from the preceding forms. It is allied to H. nigrescens Wood, but 

 lacks the strong parietal tooth of that form. The. groove or scrobic- 

 ulation marking the place of the outer basal tooth is not sufficiently 

 indicated in figure 20. 



H. NIGRESCENS Wood. PL 55, figs. 12-14. 



Imperforate, globose, solid, opaque, deep brown, shining, regularly, 

 densely, finely striate ; not granulated ; spire dome-shaped, obtuse ; 

 sutures linear, the last impressed ; whorls 4, slightly convex, slowly 

 widening, the last ventricose, with a carina sketched around the 

 periphery, slightly descending anteriorly ; aperture slightly oblique, 

 transverse, trilobed ; peristome deep brown, thickened, expanded, 

 bearing inside a compressed tooth at the place of junction of outer 

 and basal margins, which is marked behind the peristome by a slight 

 scrobiculation or groove, and another tooth on the middle of the 

 basal margin ; terminations of peristome remote, joined by a heavy 

 dark callus; parietal ivall bearing a prominent compressed entering 

 tooth. Alt. 11, diam, 17 mill. 



Dominica ; Guadeloupe. 



H. nigrescens WOOD, Index Test. Suppl. t. 7, f. 32. PFR. in 

 ConchyL Cab. p. 78, t. 10, f. 15, 16 ; Monogr. i, p. 309. REEVE, f. 

 280. GUPPY Ann. Mag. N. H. 4th Ser. i, p. 431.H.fuliginea Fer. 

 in PFR. Symbolce, i, p. 37. Dentellaria globularis Schumacher, teste 

 BECK, Index, p. 35. 



