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 Bainbridgei is said to have come from 
Demerara, but this question of disputed nomenclature the writer 
will not attempt to solve. Associated with Plewrodonte bainbridget 
at Mandeville were other interesting shells, including Pleurodonte 
peracutissima, P. anomala, Stoastoma pisum, the giant of the genus 
and the little Guppya epistyliulum. 
At Port Antonio, Plewrodonte acutu, in shape near the type, 
acutissima Lam., but very black even to the lip, was found associa- 
ted with P. valida. 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 ZONITIDE AND HELICIDE. 
BY HENRY A. PILSBRY. 
Omphalina Andrewsz n. sp. 
Shell allied to O. inornata Say in general characters and size. 
Rich chestnut colored above, opaque buff below; the surface bril- 
liant, polished. Whorls 43, 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 mm. 
