NoriJi American Helices. 13 



A simple, small, transverse tubercle, which I have called a 

 modification of the fulcrum, is found in — 



H. pustula Fer. H. Troostiana Lea. 

 tholus W. G. By. fastigans L. W. Say. 



" var. Mooreana W. G. By. hippocrepis Pfr. 



Dorfeuilliana Lea. loricata Gould. 



In mj " J^otes" above referred to I placed H. Hazardi in 

 section " D. Lip reflected, with fulcrum ;" but in my " Re- 

 marks" (Annals YL 393) I more correctly described it as 

 follows : — 



" In H. Hazardi the inferior tooth of the labriiin, at its inner end, is 

 continued back within the aperture, forming a white, erect lamella on 

 the floor of the whorl, parallel with, and leaving a narrow sinus between 

 it and the inner wall, to which it is joined at its extremity, about 2^ mill. 

 from the edge of the peristome." 



Li H. miltuosa and its near ally II, introferens^ the lamella 

 on the lower lip is continued within the aperture, where it ter- 

 minates in a somewhat diagonal, elevated callus. 



The lamella in Hazardi^ and callus in the two above named 

 species, placed much nearer to their apertures than tlie fulcrum 

 or tubercle in those enumerated in the two preceding lists, can 

 scarcely, perhaps, be considered as modifications of the fulcrum. 



It will be noticed that Albers places in Stenotrema H. pustula^ 

 also H. Lecontii Lea from California (the latter as loricata 

 Gould^ which name has priority, in Triodopsis), both having the 

 tubercle as in Troostiana and other species put by Albers in 

 Polygyra. H, germana Gould^ from California, also in Steno- 

 trema, has no fulcrum or any modification of it. 



S. sjpinosa and the species more immediately allied to it, 

 having the same form of fulcrum, are grouped together in my 

 Catalogue, while those having the tubercle and 11. Hazardi^ 

 all polygyral in character, are separated from them. H. lejpo- 

 rina and jpustuloides^ with the fulcrum of spinosa^ are placed 

 apart ; in general form they seem also to belong rather to Poly- 

 gyra than Stenotrema. H. vultuosa and introferens precede 



