342 Remarks on Certain Species of . 



nately no authentic specimen of it is now to be found in the 

 Cabinet of the Academy. 



In the letter from Dr. Griffith to Dr. Binney, quoted at 

 page 353, the former mentions having specimens of a shell given 

 to him by Mr. Lea for jejuna, but not answering Say's descrip- 

 tion. Mr. Lea, in his descriptions of II. Jlitchelliana and H. 

 Mobiliana, refers to H. jejuna, but admits, as I have already 

 stated, having had under the latter name H. clausa Say. 



It is singular that no allusion to II. jejuna is made by Dr. 

 Binney in the " Terrestrial Mollusks," excepting by name only, 

 in the lists in the first volume showing the geographical distri- 

 bution of species. 



Pfeiffer, not knowing the species, copies Say's description. 

 In a letter, however, received by Mr. ~W. G. Binney from 

 Pfeiffer, in the early part of the present year, he asks, " might 

 not H. Mobiliana Lea be identical with the lost H. jejuna Say?" 



I believe that the question may safely be answered in the 

 affirmative ; indeed I do not hesitate to accord to Dr. Pfeiffer 

 the merit of having discovered the lost species. 



Lea's description of his species is as follows : — 



"H. Mobiliana. 



" T. subglobosa, rufo-cornea, nitida, perforata, spira brevi, obtusa ; 

 suturis impressis ; anfr. 6, convexis ; apertura lunata ; labro reflexo. 



" Sbell subglobose, reddish horn color, shining, perforate ; spire short, 

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

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



" Hab. 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 

 difference being that the former is said to have a non-reflected, 

 and the latter a reflected lip. 



