AIR-BREATHING GASTEROPODS. 67 



A GROUP OF UNIVALVES. 



i. Land mollusk of Philippines (Rhysota Antonii ). 2. Eultma, that 

 lives in Holothurians. 3. Chloroea. 4. Lymnea. 5. Chlorcea. 6. Cochlo- 

 styla stabilis. 7. Planorbis. 8. Succinea. 9. Amphidromous (Malay). 

 10. Xesta. ii. Physa. 12. Cochlostyla (Philippines). 



