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Descriptions of supposed new species of Marine Shells, which 

 inhabit Jamaica. By C. B. Adams, April, 1S50, 



Narica (?) ANOMALA, Shell ovate : white, with a tinge of brown : 

 with, on the penult whorl four, and on the last whorl eight, stout ob- 

 tuse very prominent spiral ridges, which are decussated imbricately 

 by very prominent regular incremental laminae : apex acute : spire 

 with the outlines rather convex : whorls four, quite convex, with a 

 rather deep suture; last whorl large and ventricose : aperture ovate, 

 somewhat effuse and subacute anteriorly : labrura pectinate, rather 

 sharp, thickened within : columella with a small transverse plait op- 

 posite the umbilicus, expanded and flattened below. 



Mean divergence about 67=' ; length of spire .08 inch ; total length 

 .2 inch ; breadth .13 inch. 



Odostomia gemmulosa. Shell ovate-turrited : white : rather 

 thick ; with, on the upper whorls, three, and on the lower whorls 

 four stout prominent obtuse spiral ridges, and on each whorl about 

 twenty to twenty-two transverse ridges, which are continued over the 

 summits of the spiral ridges with well developed nodular intersec- 

 tions ; anteriorly with five or six similar spiral ridges issuing from 

 the aperture, and not decussated : apex subacute : spire with the 

 outlines moderately convex : whorls seven and one-half, subplanulate, 

 with a canaliculate suture : last whorl subacute anteriorly : aperture 

 ovate, rather acute above, moderately effuse and pointed anteriorly • 

 columellar plait more prominent than the spiral. ridges on the labium 

 above it. 



Mean divergence nearly 20^; length .155 inch; breadth .055 

 inch. 



Odostomia canaliculata. Shell conic, turrited : white : smooth : 

 apex acute : spire with rectdinear outlines : whorls six, planulate? 

 with the suture in a small spiral channel ; last whorl short and ab- 

 ruptly terminating : aperture broaclly ovate : columellar plait nearly 

 transverse. 



Mean divergence about 20^ ; length .12 inch ; breadth .045 inch. 



Odostomia ovuloides. Shell rather long ovate : white : smooth 

 and shining, with a scarcely impressed spiral line next below the su- 

 ture : apex subacute : spire with the outlines moderately convex : 

 whorls five and one-half, slightly convex, with a lightly impressed 



