thl: nautilus, xix. 



PLATE VI. 



Bifldaria penlodon. 1-4, 8. Buckflt'ld, Me. ; 5. Woodland, Me.; ti. Fairfield, Me.: 7. West- 

 brook, Me.: !). Alachua Co., Fla.: 10. Volusia Co , Fla ; II. San Marcos, Tex.; 12. Comal Co., 

 Tex.: 13, 1(5, 17. Wetuinpka, Ala.: 14. 15,20. Near Valley Head, Ala.; IS, 19. Woodville. Ala.: 

 21-27. Wetumpka, Ala. 



