48 BYTHINELLA. 
same form as my B. Binney, but is rather 
shorter and more conical. Specimens from the 
author in the Philadelphia collection have de- 
cidedly an European aspect, and I suspect that 
the species will not be detected in Florida. 
5. BYTHINELLA MONROENSIS, Frauen/. 
This is described as a long narrow species, 
with long mouth, five and a half whorls, grey- 
ish green, polished. From Lake Monroe and 
other localities in Florida. I have never seen 
the species, and as it has not been figured I 
am unable to give any opinion respecting it. 
It is compared with the Jamaicensis of Adams. 
Alt. nearly 4 millimetres, diameter 2:1 mill. 
B. Northern species. 
_ 6. BYTHINELLA OBTUSA, Lea. 
Plate 16, fig. 6. 
“Shell subcylindrical, rather thin, dark 
green, smooth, slightly perforate; spire short; 
(29) 
