34 HemarJcs on Certain Species of 



In the Spring of tlie present year I received many interesting 

 shells from Mr. O. M. Dorraan, collected by him at St. Augus- 

 tine, and on the St. John's River, Florida, in the neighbour- 

 hood of the Cow Ford,* mentioned by Say. Among them 

 were several very young shells, which I was unable to deter- 

 mine. Subsequently I had from the same gentleman additional 

 specimens, more, but not fully, mature, yet sufficiently so to 

 enable me to identify them with certainty as II. Mohilicma. 



This shell in its fresh state has a yoYj 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 variable, viz. : — 



Diara. maj. 8, min. 7, Alt. S-J mill. anfr. 5, Savannah. 

 " ^' 6, " 5, " 4 " " 4i St. Simon's Is. 

 " " 7, " 6, " 4 " " 5 St. Jolm's Eiver. 



Mefiix porciBan, §ay. 



Synonymy. 



Helix porcina Say Long's 2cl Exped. to St. Peter's River, II. p. 257, 



pi. 15, fig. 2. 1824. 



hirsuta Binney Terr. Moll. II. p. 150 {young\ 1851. 



Saj^'s description is as follows : — 



" H. 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. 



* Say speaks of the " Co-w Fort," but I believe tkat Mr. Dormaa's designation of 

 tbe locality as the " Cow Ford," is correct. 



