PHYSA. 



•79 



Fig. 133. 



Fig. 134. 



Fig. 135. 



Physa ampiallacea, Gould. — Shell large, ovate-ventricose, thin, 

 fragile, shining, horn-colored ; spire elevated, 

 acute ; whirls six, last one inflated ; suture de- 

 cidedly impressed ; aperture broadly ovate, five- 

 sixths the length of the shell ; labrum thin, 

 submargined with red ; columella quite flexuous, 

 covered with callus. Length 1, breadth |[} to 

 lij inch. 



Found in Oregon by Dr. J. G. Cooper. 

 Distinguished hy its large size, inflated form, 

 and delicate structure ; sometimes the form is 

 somewhat cylindrical. It accords most nearly with Halde- 

 nian's plate iii, f. 9, which was given him as P. sar/ii, Tap- 

 pan. It is much more delicate, and less polished than P. 

 heterostropha, Say, and the aperture is less elongated. 

 (Gould.) 



Pfiifsa hullata, Gould, Proc. Eost. Soc. Nat. Hist. V, 128 



(1855) ; Otia, 21(5 (not of Pot. et Mich.). 

 Physa ampullacea, Gould in litt. 



Pound also in Lake Oyosa, Washington Territory, 

 by Dr. Cooper, one of whose specimens is figured 

 above. (Fig. 133.) 



The name proposed by Dr. Gould for this species being- pre- 

 occupied by Potiez and Michaud, I, 223, 1838, he suggests that 

 adopted above. 



