ichich inhabit Jamaica. 159 



urn in a rather thin curved lamella, extends over half the en- 

 trance to the umbilical arch. 



Mean divergence 165° ; height .065 inch ; least breadth 

 .095 inch ; greatest breadth .118 inch. 



A small thick variety of Trochatella pulchella occurs in 

 Portland, with the spiral ridges remarkably prominent. It 

 may be designated by the name of multicarinata. Another 

 variety occurs at the opposite extremity of the island, at New 

 Hope in Westmoreland, which is very large, and has the 

 last whorl well rounded over the periphery, without any keel : 

 it has no sculpture except the impressed spiral lines on the 

 spire and on the upper part of the last whorl. The lip is less 

 expanded than in the type of the species. It may be desig- 

 nated by the name of kobilis. 



Of Helicina 7ieritella, a variety, angulata, is distinguished 

 by an angular periphery, and by a double and much thickened 

 lip. 



Geomelania Hilliana. Shell conic-cylindric : white : with, 

 on each whorl, about 33 to 35 small obtuse ribs, which are 

 obsolete anteriorly and behind the labrum : spire with recti- 

 linear outlines: apex truncate with the loss of whorls: 



whorls remaining six, very convex, with a deep suture : aper- 

 ture suborbicular, moderately efi'use : labrum well expanded 

 and reflected, thin ; linguiform part moderately produced ob- 

 liquely on the side, obtuse: labium well thickened and regu- 

 larly reflected, slightly disjunct from the penult whorl. 



Mean divergence about 11°; length .25 inch; greatest 

 breadth .085 inch; least breadth .07 inch. 



Geomelania pyraahdata. Shell elongate conic : whitish : 

 with, on each whorl, about 28 small obtuse ribs, which, on 

 the last whorl, terminate a little below the periphery : spire 

 with rectilinear outlines : apex usually truncate with the loss 

 of two or three whorls : whorls remaining seven or eight, quite 



