HELIX-DENTELLARIA. 87 



ulate except on the inner whorls ; spire low, dome-shaped, apical 

 whorl flat, sutures linear, becoming impressed at the last whorl ; 

 whorls 5, slightly convex, slowly widening, the last depressed, sub- 

 carinate at the periphery, abruptly and deeply deflexed anteriorly, 

 strongly constricted behind the peristome ; aperture subhorizontal, 

 oblong, transverse, upper and lower margins parallel ; peristome 

 dark purplish brown, right and basal margins expanded, basal 

 margin subhorizontal, reflexed and adnate to the whorl at the 

 umbilical tract, bearing within a strong compressed, slightly enter- 

 ing tooth at junction of basal and outer lips, and a low, wider tooth 

 near the columella ; terminations not converging, but joined by a 

 thick callus. Alt. 10, diam. 17 mill. 



Martinique; Guadeloupe; St. Lucia; Cayenne. 



. H. badia FER. Prodr. 124; Hist. t. 56, f. 1-4. PFR., Conchyl. 

 Cab. p. 355, t. 63. f. 7-10 ; Monogr. i, p. 309. GUPPY, Ann. Mag. 

 N. H. 1869, p. 431.Dentellaria badia W. G. BINN. Ann. N. Y. 

 Aead. Sci. iii, 1884, p. Ill, t. 16, f. Q ; t. 9, f. G. (jaw and dentition.) 



Pfeiffer notes a small form from Martinique which is acutely 

 carinated, narrowly but openly umbilicate. There is considerable 

 variation in color ; some specimens are light yellowish, the peristome 

 white or dark. Numerous light-brown specimens, with or without 

 two dark bands, and with light or dark peristome are before me 

 from Martinique. The body-whorl is much more depressed in this 

 shell than in H. pachygastra, and the surface is microscopically 

 granulated. 



Var. GUADELOUPENSIS Pilsbry. PL 29, fig. 28. 



Shell depressed, carinated at the periphery, of a medium shade of 

 chestnut brown, with a lighter peripheral line ; surface granulated 

 as in H. badia ; peristome broadly expanded, pure white ; teeth of 

 the basal margin large, nearer together than in H. badia, the right 

 margin bearing a small tubercular denticle in adult examples. 



Alt. 7, diam. 12 mill. 



The tubercle of the right margin is concealed by the curve of the 

 lip in the figure of this form. 



H. LYCHNUCHUS Muller. PI. 28, figs. 5-9. 



Im perforate, depressed trochoidal, acutely carinated, solid, opaque, 

 nearly lusterless, dark chestnut colored, obliquely striate, densely, 

 finely granulate, the granules barely visible to the unassisted eye. 

 Spire conical, very obtuse ; apical whorl flat ; sutures linear ; whorls 



