AMERICAN JOURNAL OF CONCHOLOGY. Plate 6. 



3. 



Fig. 1. Helix tryani, Newcomb. 

 " 2 — 10. Jaws nf Helix tryoni, Ntwcomb. 

 " 11. Ariolimax Cohimbianus. 

 " 12. Jaio of A. Cohimbianus. 

 "13. Lingual dentition of A. Columbianus. 



