S2 Bemarhs on Certain Species of 



'^ Breadth rather more than one-fifth of an inch. Inhabits the South- 

 ern States. 



" Animal — light reddish brown, with a granular surface, longer than 

 the breadth of the shell ; oculiferous tentacula elongated, and rather 

 darker than the body. 



" This shell is very closely allied to H. sericua of Southern Europe, 

 but it differs from that species in being destitute of the hirsute vesture. 

 I found several specimens of jejuna, during an excursion some time since 

 into East Florida, at the Cow Fort on St. John River. It is in the col- 

 lection of tho Academy." 



This species has not hitherto been identified, and unfortu- 

 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 43, the former mentions having specimens of a shell given 

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

 tion. Mr. Lea, in his descriptions of H. Mitchelliana and S. 

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

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



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

 Binney in the " Terrestrial MoUusks," 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 II. MoMliana Lea be identical with the lost M. jejuna Say?" 



I believe that the question may safelj 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. MOBILIAITA. 



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

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

 " Shell subglohose, reddish horn color, shining, perforate j spire shorty 



