HELIX. 87 



Say, one large tooth on the left lip, and two smaller ones on the 

 right lip. It differs from the first in not being carinate, from the 

 last in being larger, and having larger strife. In the Dorfeuilliuna 

 the tooth on the left lip is large and square, with an indentation in 

 the centre. The view into the mouth is nearly obstructed by the 

 teeth, leaving, to appearance, three nearly square apertures. The 

 superior part of the shell is striate, while the inferior part is nearly 

 smooth, and exhibits two volutions. I have seen but a single speci- 

 men, which, I believe, is the only one obtained by Mr. Dorfeuille, 

 who obligingly sent it to me. 



Mr. J. G. Anthony obtained from Mr. Dorfeuille some 

 facts concerning the original discovery of this species, 

 which prove beyond all doubt that it was accidentally 

 brought from Kentucky. It is not an inhabitant of Ohio. 



The species has been confounded with several others by 

 Reeve, Pfeiffer, Deshayes, and Binney. Bland was the 

 first after Lea to correctly treat it. He thus describes its 

 characteristics : — 



H. DorfeuiUiana Lea differs materially in its characters from the 

 three preceding species ; the stria? on the upper surface are not so 

 well defined as in Troostiana, but more so than in Hazardi, while 

 the base is more smooth than in either of them, having only very 

 delicate striae, with microscopic impressed spiral lines. 



The parietal tooth is quadrate, — the two teeth on the right lip 

 are more nearly of the same size and form than in fatigiata and 

 Troostiana. In this species the inferior tooth is transverse, and in 

 some specimens broader than the superior one, but has a somewhat 

 pointed apex, — both are very nearly equally deeply seated, but so 

 far apart as to allow a view between them into the aperture, leav- 

 ing, as Mr. Lea expresses it, " to appearance three nearly square 

 apertures." Say would have described the two teeth as " separated 

 by a remarkable sinus." The peristome of this is more thickened 

 and less reflected than in the other species, — behind it is deeply 

 constricted, without any appearance of pits showing the position of 

 the teeth within. 



