PULMONATA PHYSIDAB PHYSA ELLIPT1CA. 



937 



P/iysa dliptica, LEA, Trans. Am. Phil. Soc. Phila,, v, 1837, 115, pi.. Id., Obs., i, 227. 

 DEKAT, N. Y. Moll., 1843, 77 (cxcl. syu. cylindrica, err. typ.). CHEMNITZ, 

 ed. 2, 22, pi. iii, figs. 20, 22. 



* Physa Mldrcthiana, LEA, Proc. Am. Phil. Soc. Phila., ii, 1841, 32. Id., Trans., is, 

 1844, 7. Id,, Obs., iv, 7. 



Widely distributed throughout tlie United States. 

 Collected as follows: 



PHYSA ELLIPTICA, Lea. 



Physa elliptica, LEA, Traus. Am. Phil. Soc. Phila., v, 1837, 115. 

 Physa olcacca, TKYON, Am. Jour. Conch., ii, G. 



This species is widely distributed; the extreme points, as far as known, 

 being Vermont, San Francisco, Michigan, Georgia, Louisiana, and Utah, 

 and it is also believed to exist in Eastern Nevada and Northern Arizona. 

 Some of the specimens secured were from the Virgin River in Southern 

 Utah, not more than seven or eight miles from the Arizona border, which 

 would seem to indicate an extreme southern limit, beyond our present 

 knowledge. 



NOTE. Dr. Lewis informs me that he has specimens referable to this 

 species, but does not confound them with the less solid and more slender 

 elliptica. 



* It may bo said, iu regard to this species, that Mr. Lea upholds it tenaciously ; and it is but fair' to 

 state, if it is uot distinct from Pliysa gyrina, it is a very strongly marked variety. 



