444 Remarks on Certain Species 



10. One 2')(irietal and two lip teeth. 

 H. inllecta Say. 



" Rugeli Shuttl. 



" tridentata Say. 



" Hopetonensis Shuttl. 



" fallax Say. 



11. One parietal lamella, continued from its lower end upwards to 



superior termination of Up, and two lip teeth. 

 IT. triodontoides Bland. 



" Hindsi Pfr. | upper lip tootli 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 lip teeth, 

 H. septemvolva Say. 



" ccreolus Muhlf. ) , , . ' , , . 



-, . ni 1 r have also an internal lamina. 



" Carpentenana Llano. ) 



13. Modification of same form oj" parietal lamella, with tivo lip teeth, 



more or less lamelliform. 

 H. oppilata Mor. 



" auriformis Bland, upper lip tooth with incipient hook. 

 " avara Say. 



" espiloca Eav. 



" Postelliana Bland. 



" auriculata Say. 



" uvulifera Shuttl. 



upper lip tooth with hook ; the lip 

 teeth especially in H. auriformis and 

 H. avara are modifications of the 

 notch of ^. hirsuta. 



" Ariadne Pfr. 



14. Tivo pjarallel 2mrietal lamince, with internal teeth. 

 H. labyrinthica Say. 



H. Hubbardi Brown.* 



C. With fulcrum. 



15. One parietal lamelliform tooth, loiver lip more or less laminated. 



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

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

 viter reflexo." 



