ine N Serius. 
VOL. x. AUGUST, 1896. No. 4 
A NEW SPECIES OF POMATIOPSIS. 
BY HENRY A. PILSBRY. 
The genus Pomatiopsis is peculiar to North America. All of the 
species occur in the temperate portion of the continent, and the 
whole United States, excepting perhaps parts of the Rocky Mount- 
tain region, still but imperfectly explored for small shells, is occupied 
by the various forms. The best-known species P. lapidaria Say, is 
as much a terrestrial mollusk as most of the Succineas. They can- 
not live for any length of time immersed in water, and I have 
drowned specimens, just as land snails may be drowned, by confin- 
ing them in a vessel full of water. Information upon the other 
species is less definite, but P. cincinnatiensis at least seems to be of 
aquatic habits. 
The genus is much more distinct than most genera of A mnicolide, 
the dentition being, as William Stimpson first pointed out, strikingly 
characteristic of the group. ‘The shells vary from the high, turrited 
Bythinella form, to nearly as short as some Amnicolas. 
The species described below is the third from the Eastern States, 
and the fourth species of the genus, the others being P. lapidaria 
Say, P. cineinnatiensis Lea and P. intermedia Tryon. 
Pomatiopsis Hinkleyi n. sp. 
Shell perforate, turrited, decidedly stouter in figure than P. lapid- 
aria, but less compact and widely conic than P. cincinnatiensis. 
Olive-brown. Surface with growth-lines about as in P. lapidaria. 
Whorls 6, very convex, separated by a deep suture. Aperture 
