344 Remarks on Certain Species of . 



This shell in its fresh state has a very delicate epidermis, 

 having a silky lustre. The lower half of the first and part of 

 the second whorl have microscopic raised spiral lines, which I 

 have detected in the specimens received from Bishop Elliott 

 and Mr. Dorman. 



The size is variahle, viz. : — 



Diam. maj. 8, min. 7, Alt. 5£ mill. anfr. 5, Savannah. 

 " " 6, " 5, " 4 " " 4£ St. Simon's Is. 



" " 7, " 6, " 4 " "5 St. John's River. 



Helix porcina Say. 



Synonymy. 



Helix porcina Say Long's 2d Exped. to St. Teter's River, TI. p. 257, 



pi. 15, fig. 2. 1824. 



hirsuta Binney Terr. Moll. II. p. 150 (young), 1851. 



Say's description is as follows : — 



" II. PORCINA. 



" Shell depressed, yellowish brown ; epidermis rugose, with minute, 

 very numerous bristles ; whorls rather more than four, depressed above, 

 beneath rounded, forming a very obtuse angle rather above the centre 

 of the whorl ; umbilicus open, rather small, profound ; labrum simple. 



"Breadth rather more than three-tenths of an inch. Inhabits the 

 North-West Territory." 



The annexed is a fac-simile of Say's figures. I cannot ac- 

 quiesce in Dr. Binney's opinion that H. porcina 

 Say " appears to correspond to H. hirsuta Say in 

 an immature state." 



Say originally described II. hirsuta in Nichol- 

 son's Encyclopaedia (1816), the description was 

 also published in the Journal of the Academy in 

 1817. In the same Journal (1821), he enume- 

 rates it, among other species observed in the "Western regions, 

 as being " common as far as Council Bluff." 



