135 



Mean divergence 110° ; greatest breadth .6 inch ; least 

 breadth .05 inch ; height .45 inch. 



The slit, or notch, as it might be called with equal pro- 

 priety, is uniform in all the specimens before me. In this, as 

 in most other characters, the species is intermediate between 

 H. hirsuta and H. albolabris. It occurs in the parish of 

 Westmoreland, the west part of the island. 



Some specimens from the opposite extremity of the island, 

 St. Thomas in the East, closely resemble H. cons an guinea, 

 except in having the aperture well dilated and rounded in the 

 upper part, instead of being contracted by a sinus in the lip ; 

 they also have the notch a little deeper, and the last whorl is 

 a little more convex beneath. The shell also is much like 

 H. hirsuta, but the slit is not so deep, and the aperture is 

 longer and narrower. They present a distinct type, but I 

 merely propose for it the name of soror, without deciding 

 whether it be of specific value. 



Heltcina microstoma. Shell globose conic, moderately 

 thickened : " brown, shaded off to a smoky white along the 

 suture" and on the periphery of the last whorl : with rather 

 light striae of growth, in which are a few spiral series of 

 punctures : apex obtuse : spire with the outlines more or less 

 and not uniformly curvilinear : whorls rather less than five, 

 moderately convex, with a well impressed suture ; last whorl 

 subplanulate beneath : aperture semi-elliptical, compressed 

 above and below, laterally dilated ; with the lip sinuate, well 

 expanded and reflected except at the extremities ; with the 

 slit not very deep, rather wide. 



Mean divergence 60° ; greatest breadth .65 inch ; least 

 breadth .52 inch ; height .4 inch. 



The slit is about as deep as in H. consanguinea, but the 

 sides are less divergent. The punctate spiral series indicate 

 spiral lines of hairs on the epidermis. For two faded speci- 



