58 POMATIOPSIS. 
change the name, because in January, 1840, 
Mr. John G. Anthony described an Amnicola 
under the same name,—which of course had 
priority. Mr. Anthony suggested “Sayana” 
for Dr. Lea’s species, and under that name it 
has been hitherto known. But the species 
differs generically from Amnicola, and as Dr. 
Lea’s name is thus again capable of being used, 
I restore it. 
The animal of Pomatiopsis prefers damp loca- 
tions in the vicinity of streams, but does not, 
like the Amnicola, live habitually under water. 
It is an air-breather, but possessed of a true 
gill. Its locomotion is made by first protruding 
and attaching the snout, then carrying the 
front of the body forward, and finally drawing 
the posterior parts after,—very different from 
the gliding motion of the Amnicole. The 
shell of Pomatiopsis is elongated like that of 
Bythinella, but differs in the margin of the lip 
being reflected, presenting a very striking re- 
semblance to the European terrestrial genus 
Pomatias,—whence the generic name. 
(39) 
