JVorih American Ilelicidce. 33 



obtuse, sutures impressed, whorls 6, convex ; aperture lunate ; lip 

 reflected. Diara. .30, length .25 of an inch. 



" Ifab. Vicinity of Mobile, Ala. 



" Remarks. In form it is somewhat like H. jejuna Say, but is not 

 one-fourth its size, and differs in color. There is rather a deep groove 

 behind the lip, which is reddish. The umbilicus is small." 



It will be seen on comparing the descriptions of II. jejuna 

 and II. Mobiliana that they agree pretty closely, the principal 

 difierence being tluit the former is said to have a non-reflected, 

 and the latter a reflected lip. 



Dr. Binney (in Terr. Moll.) very accurately describes Lea's 

 species ; he says, " lip white, very narrow, reflected, a deep 

 groove behind it ; aperture well rounded, semicircular, consi- 

 derably contracted by the impressed groove behind the lip, 

 and a corresponding testaceous deposit, or rib, within." He 

 remarks in addition : " a great part of the specimens have the 

 aperture in a much less developed condition, the lip being 

 acute, or the reflection but partly completed, and the depression 

 behind the lip not visible." 



I have many specimens of ^. Mobiliana., collected in the 

 old Cemetery at Savannah, by Bishop Elliott, and on St, 

 Simon's Island, by Mr. Postell ; in none can the lip be said to 

 be, in the ordinary acceptation of the term, reflected, excepting 

 slightly at the base of the aperture, and by the umbilicus. 



"With respect to the animal of II. Mobiliana, Mr. Postell has 

 favored me with the following note : " Animal longer than the 

 shell, very light yellowish ; granulate ; superior tentacles very 

 dark, almost black, with a dark brown stripe running along 

 the body, from the base of each ; inferior tentacles much 

 shorter, of same color as the body." This description agrees to 

 a considerable extent with Say's H. jejuna. I attach very little 

 importance to the difl'erence in color of the body of the animal. 



Lea describes the species as having six whorls. I have not 

 seen any specimen from the habitat assigned by him, but all in 

 my cabinet have from four and a half to flve whorls. 



