162 PHYSA. 
ce. PHYSA SEMIPLICATA, LKiister. 
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 presented by the author 
which would induce me to regard it as possi- 
bly American. 
B. Cylindrical Species. 
41. PHYSA GYRINA, Say. 
Hald. Monog. 382, t. 3, figs. 1—6. 
Physa cylindrica, Newcomb. Plate 9, fig. 4. 
Physa Hildrethiana, Lea. Plate 9, fig. 5. 
Physa Hawnii, Lea. Plate 9, fig. 6. 
Physa Saffordii, 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- 
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