14 THE NAUTILUS. 



oration. Indeed, it is uncertain which is the type color. The vet- 

 eran Jamaica conchologist, Mr. Henry Vendryes, believes, with 

 Bland and others, that pretiosa is the type and the dark shells 

 varieties. The genuine Eainbridgei is said to have come from 

 Demerara, but this question of disputed nomenclature the writer 

 will not attempt to solve. Associated with Pleurodonte bainbridgei 

 at Mandeville were other interesting shells, including Pleurodonte 

 peracitt'issima, P. aiiomala, Stoastoma pisum, the giant of the genus 

 and the little Gnppya epistyllithnn. 



At Port Antonio, Pleurodonte acuta, in shape near the type, 

 acutissima Lam., but very black even to the lip, was found associa- 

 ted with P. validfi. A form almost equally black, but with light 

 lip, was found at Manchioneal. These shells were strikingly differ- 

 ent from the varieties of P. acuta found in other parts of the island. 



Bulimus exilis, a very common West Indian shell, but not pre- 

 viously reported from Jamaica, was found abundantly at Castleton 

 not far from the botanical gardens. It was probably imported on 

 plants. 



On the hills at Mandeville, a dagger-leaved plant, which retained 

 a considerable quantity of rain water in the axils of its large leaves, 

 was much frequented by Thelidomus aspera. The mollusk was often 

 found with its body touching the water. 



NEW FORMS OF AMERICAN ZONITIDJE AND HELICID.2E. 



BY HENRY A. PILSBRY. 



Omphalina Andrewsse n. sp. 



Shell allied to 0. inornata Say in general characters and size. 

 Rich chestnut colored above, opaque buff below; the surface bril- 

 liant, polished. Whorls 4J, slightly convex, slowly widening, sep- 

 arated by moderately impressed, margined suture ; spire small, very 

 low-convex, its width less than half that of the shell ; last whorl 

 very wide, depressed, rounded at periphery, evenly flattened-con- 

 vex beneath ; convex around the deeply indented umbilical perfora- 

 tion. Aperture slightly oblique, elliptical-lunate; interior lined 

 with a heavy white callus which thins out and disappears a few 

 millimetres from the lip-edge; the latter thin, sharp; columellar 

 margin concave, expanded in a minute triangle slightly impinging 

 on umbilicus. Alt. 8, greater diameter 16, lesser 13'2 mm. ; width 

 of spire 7 nun. 



