of North American HelicidoB. 121 



10. One imrietal and two Up teeth. 

 H. inflecta Say. 



" Rugeli Sbuttl. 



" tridentata Say. 



" Ilopetonensis Sbuttl. 



" iallax Say. < 



11. One 2)arietal lamella, contimied from its lower end upwards to 



superior termination of lip, and two Up teeth. 

 II, triodontoides Bland. 



" Hindsi Pfr. ) tipper lip tooth modification of the notch of 

 " ventrosula Pfr. [ H. hirsuta. 

 " Texasiana Mor. — both lip teeth ditto, 



12. Modification of same form of parietal lamella, with no Up teeth. 

 H. septemvolva Say. 



" cereolus Muhlf. ) , , . . , , • 



[ have also an internal lamina. 

 " Carpenteriana Bland. ) 



13. Modification of same form of parietal lamella, ivith two lip teeth, 



more or less lamelliform. 

 H. oppilata Mor, 

 " auriformis Bland, upper lip tooth with incipient hook. 



" avara Say. 

 " espiloca Rav. 

 " Postelliana Bland. 

 " auriculata Say. 

 " uvulifera Sbuttl. 



upper lip tooth with hook ; the lip 

 teeth especially in JI. auriformis and 

 H. avara are modifications of the 

 notch of JI. hirsuta. 



" Ariadne Pfr. 



14. Tivo parallel parietal lamince, loith internal teeth. 

 H. labyrinthica Say. 



H. Hubbardi Brown.* 



C. With fulcrum. 



15. One p)cirietal lamelliform tooth, loioer lip more or less laminated. 



* The lip of //. Hubbardi is reflected. Brown in his description (Proc. Acad. 

 N. ScL, Phila. 1861), by an oversight has the word " simplici" as well as "bre- 

 viter reflexo." 



