Genus Ponipliolyx. 



Pompholyx effusa, Lea, H, Sj- A. Ad. 



Genus Pliysa. 



Physa aurantia, Carp. 

 Aplexa aurantia, Carp. 

 Aplexa peruviana, Mke. • 



Physa elata, (IIJ. 



Aplexa. data. Carp. 



Physa gyrina, Say, De Kay, Kiist., 

 C\ B. Ad., Hald. 

 Physa elliptica. Lea, De Kay. 

 Physa cylindriea, De Kay. 

 Physa hildrethiana, Lea. 



Physa ampullacea, Gould. 



Physa. bnllala, GUI., not Pot. et 

 Mich. 

 Physa mexicana, Phil. 

 Physa vinosa, Gld. 

 Physa ancillatia, Say, Old., Ilakh, 

 C. B. Ad., De Kay, Kustcr, 

 Chenn. 

 Physa ohesa, De K. 

 Physa sayii, Tappan. 



Physa osculans, IlaUl. 



Physa nitens, Phil. 

 Physa heterostropha, Say, Hald., 

 (Joidd, C. B. Ad., Desk, in 

 Lam., Kiist., De Kay, M. E. 

 Gray, Pot. et Mich. 



Livincea hcterostro])ha. Say. 



Physa fontana, Hald. 



Physa cylindriea., Newc. 



Physa anrea. Lea, De K. 



Physa pllcata, De K. 



Physa osculans, Hald. (part). 



Physa glabra, De K. 



Physa striata, Mke. 



Physa. suharata, Mke. 



Physa charpenticri, Kiist. 



Physa phillipii, Kiister. 



Physa elliptica. Lea. 



Physa injlata. Lea. 



Helix heterostrophus, Eaton. 



Bulla crassida, Dillw. 



Bulla fontinalis, Chemn., Gmel., 

 Schroter. 



Cochlea neritoides, List. 

 Physa hypnorum, Lin., Hald., C. 

 .. B. Ad. 



Physa elongata. Say, Gld., De K. 



Physa elongatina, Lewis. 



Aplexa hypnorum, Chenu, &c. 

 Physa Integra, Hald., De IC. 



Aplexus (^Isadora) Integra, 



Chenu. 

 *Physa fragilis, Mighels, C. B.Ad., 



Hald. 

 *Physa semiplicata, Kiist. 

 *Physa costata, Newc. 

 Physa solida, Phil. 

 Physa virginea, Gld. 

 Physa humerosa, Gld. 

 Physa pomilia, Conrad, De Kay, 

 Muller. 



*Physa globosa, Hald. 



Phisella globosa, Chenu. 

 Physa virgata, Gld. 



Physa microstoma, Hald. 



Physodon microstoma, Chenu. 

 *Physa distorta, Hald. 

 Physa troostiana, Lea. 

 Physa triticea, Lea. 

 *Physa concolor, Hald., De K. 



