North American Helicidce. 343 



Dr. Binney (in Terr. Moll.) very accurately describes Lea's 

 species ; he says, " lip white, very narrow, reflected, a deep 

 groove behind it ; aperture well rounded, semicircular, consi- 

 derably contracted by the impressed groove behind the lip, 

 and a corresponding testaceous deposit, or rib, within." He 

 remarks in addition : " a great part of the specimens have the 

 aperture in a much less developed condition, the lip being 

 acute, or the reflection but partly completed, and the depression 

 behind the lip not visible." 



I have many specimens of H. 3fooilia?ia, collected in the 

 old Cemetery at Savannah, by Bishop Elliott, and on St. 

 Simon's Island, by Mr. Postell ; in none can the lip be said to 

 be, in the ordinary acceptation of the term, reflected, excepting 

 slightly at the base of the aperture, and by the umbilicus. 



"With respect to the animal of H. Ifobiliana, Mr. Postell has 

 favored me with the following note : " Animal longer than the 

 shell, very light yellowish ; granulate ; superior tentacles very 

 dark, almost black, with a dark brown stripe running along 

 the body, from the base of each ; inferior tentacles much 

 shorter, of same color as the body." This description agrees to 

 a considerable extent with Say's IT. jejuna. I attach very little 

 importance to the difference in color of the body of the animal. 



Lea describes the species as having six whorls. I have not 

 seen any specimen from the habitat assigned by him, but all in 

 my cabinet have from four and a half to five whorls. 



In the Spring of the present year I received many interesting 

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

 tine, and on the St. John's Kiver, 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. Mobiliana. 



* Say speaks of the " Cow Fort," but I believe that Mr. Dorman's designation of 

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



