POMATIOPSIS. 57 



2. POMATIOPSIS LUSTRICA, Say. 



Hald., p. 16. 

 Plate 17, fig. 7. 



Haldeman suggests that this is the young of 

 P. lapidaria, and an examination of the tyj)e 

 specimen in the Academy's collection at Phila- 

 delphia leads me to think it probable that he 

 is correct in his surmise. Bytliinella obiusa, 

 Lea, and other species, are occasionally dis- 

 tributed by collectors under the above name. 



3. P. CINCINNATIENSIS, Lea. 

 Hald., p. 19, t. i, fig." 11. 



Inhabits from Western New York to Min- 

 nesota and Iowa, and southwards to the Ohio 

 River. 



This S23ecies was first described as a Cyclos- 



toma, under the above specific name, by Dr. 



Lea, in Oct., 1840, but upon referring the shell 



to the genus Amnicola it became necessary to 



(38) 



