146 PHYSA. 



2. Species inhabiting the States east of the 

 Rocky Mountains. 



A. Inflated species. 

 23. PHYSA ANCILLARIA, Smj. 



Plate 8, fig. 1. 



Hald., Monog., p. 27, t. 3, figs. 1 to 8, 10 (excl. 9). 



The form of this shell is generally obovate, 

 the upper part of the body whorl being round 

 shouldered. I have figured a fine typical form 

 from Moravia, N. Y. (fig. 1.) 



24. PHYSA SAYII, Tappan. 



Ph. ancillaria (part), Hald., t. 3, fig. 9. 



Physa Warreniana, Lea. Plate 8, fig. 2. 



. Shell ovate much inflated, color brownish- 

 yellow or chestnut; whorls five; the first 

 large, the others small, terminating in an 

 acute dark brown apex ; aperture large, four- 

 fifths of the length of the shell, translucent. 

 (62) 



