298 Worth American Helicida. 



Diam. maj. 8, min. Y, alt. Z\ mill. 

 ' ; " 6^ " 5£ " 3 « 



With respect to the shell considered by Shuttleworth to be 

 H. Borfeuilliana, it will be seen from the figure (PI. ix. fig. 

 26), which differs, as he says, from Lea's, that the superior tooth 

 on the labrum is larger and more deeply seated than the infe- 

 rior one, and that the latter, though more developed, is much 

 of the same form as the inferior tooth mfatigiata and Troosti- 

 ana. The parietal tooth partakes of the general character of 

 that in Lea's type of Dorfeuilliana, but its lower and terminal 

 margins project more perpendicularly from the parietal wall. 

 The umbilical perforation is also larger, and the base of the 

 shell is more smooth. 



The following are the measurements of a large specimen : — 



Diam. maj. 9, min. 8, alt. 4. 



I am much inclined to consider this a distinct species, but 

 remark upon it, as I believe it is more commonly found in 

 cabinets under the name of Dorfeuilliana, than the shell 

 described by Lea. 



H. Dorfeuilliana,, and also the shell last considered, have a 

 tubercle within, very similar to that in fatigiata and Troosti- 

 ana. 



Both forms were given to me, neither separated nor deter- 

 mined, by Mr. J. G-. Anthony, with Kentucky as habitat. 



This species does not inhabit Ohio, — Mr. Dorfeuille resided 

 at Cincinnati, but there must have been some mistake as to 

 the habitat of the specimen sent to Mr. Lea. 



Note. — H. Texasiana Mor., with which Pfeiffer and other authors 

 confound Sa}*'s above named species, is very distinct, especially in the 

 form of the parietal and other teeth, — the two on the peristome are 

 moreover on its margin. I publish a copy of Moricand's magnified 



