18 The American Xaturulist. 





L. humilis Say. 



Much like the preceding only a little larger, common. 

 L. caperata Say. 



A more robust species than the preceding but almost equally 

 common. 

 L. kirtlandiana Lea. 



There is much confusion about this species. The type was 

 evidently only about half grown. The mature shell is quite 

 common and it may prove to be only a slender form of the 

 following. 

 L. palustris Mull. 



I do not know that this species has been collected here but 

 I think it has and I have no doubt of its existence in the 

 county. 

 L. reflexa Say. 



I have not seen it here but Mr. Streator reports it rather 

 common at Garrettsville. 



Genus Bulinus Adanson. 

 Iiidlnns hypnorum Linn. 



Not uncommon with habitat like the Limmeas in stagnant 

 waters. 



Genus Physa Drap. 

 Physa heterostropha Say. 



If Mr. Say had placed everything under this head that he 

 could not place elsewhere the result would be about what we 

 find it; an extremely variable and abundant species. 

 Physa sayi Tappan. 

 Physa zordii Baird. 

 Physa ancillaria Say. 



All found here and all may prove only varieties of hetero- 

 stroplm. I have collected the latter in Stewart's Lake together 

 with ancillaria and more than half were doubtful as to which 

 species they belonged. I regard ancillaria as only a variety. 

 Physa gyrina Say. 



Equally variable with heterostropha and almost as common. 



