North American Helicidce. 341 



The size is somewhat variable. I add the measurements of 

 the largest and smallest individuals : — 



Diam. maj. 17, min. 14, Alt. 9*, mill. 

 " " 15, " 13, " 9 " 



Helix jejuna Say. 



Synonymy. 



Helix jejuna Say Jour. Acad. N. Sci. Phila. II. p. 158, 1821. 



Mobiliana Lea Proc Am. Phil. Soc. II. p. 82, 1841. 



" " Obs. IV. p. 17. 



jejuna Be Kay N. Y. Moll. p. 46, 1843. 



Mobiliana Pfr. Mori. I. No. 844, 1848. 



" Binney Terr. Moll. II. p. 172, pi. 42, fig. 2, 1851. 



jejuna W. G. Binney Reprint Say's Descr. p. 19, 1856. 



Say's description is as follows : — 



"Helix jejuna. 



"Shell subglobular, glabrous, pale reddish brown; volutions five, 

 slightly wrinkled, regularly rounded ; spire convex ; suture rather 

 deeply impressed ; aperture dilate lunate ; labrum a little incrassated 

 within, not reflected; umbilicus open, small. 



" 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. sericea 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 the Academy." 



This species has not hitherto been identified, and unfortu- 



