162 PHYSA. 



c. PHYSA SEMIPLICATA, Kuster. 



Binney, p. 90, f. 154. 



I have not figured this species because it 

 belongs to the Australasian type of the genus, 

 and no evidence is jDresented bj the author 

 which would induce me to regard it as possi- 

 bly American. 



B. Cylindrical Species. 



41. PHYSA GYRINA, Say. 



Hald. Monog. 32, t. 3, figs. 1—6. 



Physa cylindriea, Newcomb. Plate 9, fig. 4. 

 Physa Hildrethiana, Lea. Plate 9, fig. 5. 

 Physa Hawnii, Lea. Plate 9, fig. 6. 

 Physa Saffordu, Lea. Plate 9, fig. 7. 

 Physa parva, Lea. Plate 9, fig. 8. 



The above is a tremendous synonymy, but 

 I am utterly unable to find any characters by 

 which either of the above species shall be sep- 



(78) 



