48 BYTHINELLA. 



same form as my B. Binneyi, 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, Frauenf. 



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) 



