12 ROCHESTER ACADEMY OF SCIENCE. [Oct. 26, 



Limnaea reflexa, Say. (pi. 6, fig. 5, 6.) Rochester. 

 LimncBa elongata, Say. 

 " umbrosus, Say. 

 " exilis, Lea. 

 " liisiortus, Ross. 

 Limnaea elodes, Say. (pi. 6, fig. i, 2.) Erie canal. 

 Lim ncea /ragilis, H a 1 d . 

 " palusiris, Miill. 

 '' Nutialiiana, Lea. 



plebeia, Gld. 

 " expansa, Hald. 



Limnaea pallida, Ad. (pi. 6, fig. 12, 13.) Erie canal. 

 Limmea pallida, Hald. 

 " " De Kay. 



Limnaea caperata, Say. Pimjord. 



Limnaea catascopium. Say. (pi. 6, fig. 10, n.) Rochester. 

 Limmca cornea, Val. 

 " pinguis, Say. 

 " virginiana, Lam. 

 " sertcata, Zieg. 

 Limnaea columella, Say. (pi. 6, fig. 3, 4.) Erie canal. 

 Limncea chalybea, Gld. 

 " mucrostoma, Say. 

 " acuminata. Ad. 

 " navicula, Val. 

 " sirigosa, Lea. 

 " coarctata, Lea. 

 " casta, Lea, 

 " succinifonnis, Ad. 

 " coliimellaris. Ad. 

 Limnaea desidiosa, (pi. 6, fig. 7, 8.) 

 Physa gyrina, Say. (pi. 6, fig. 16,17.) Erie canal. 

 Physa elliptica, Lea. 

 " Hildrethiana, Lea. 

 Physa ancillaria, Say. (pi. 6, fig. 18, 21.) Rochester. 



Physa obesa, De Kay. 

 Physa heterostropha, Say. (pi. 6, fig 14, 15.) Rochester. 

 Physa fontana, Hald. 

 " cylindrica, Roe. 

 " aurea, Lea. 



