Notes on Certain Terrestrial Mollusks. 87 



Helicina nemoralis, Guppy. 

 This Trinidad species can scarcely be considered distinct 

 from H. Columbiana, Philippi of Venezuela. 



Auricula pellucens, Menke. 



In 1871 I received several dead specimens of this species 

 of Auricula from Mr. Henry Prime. He informed me that 

 he "found about a dozen, none with the animal, on Punta 

 Rasa, a small island on the west coast of Florida, at the 

 mouth of Calvasahachee River ; they were in one place only, 

 at the edge of a mangrove swamp, in company with Melam- 

 pus bidentatus and M. coniformis; the latter were in great 

 abundance." 



Auricula pellucens is referred to Demerara and JEllobium 

 Ceylanicwn, H. & A. A., placed in its synonymy by Pfeif- 

 fer, to Ceylon. I have one specimen from each of those 

 localities, given to me by the late Mr. Swift, and they are 

 certainly very like those from Florida. 



Pfeiflfer gives the Antilles also, with doubt on the author- 

 ity of Ferussac, as one of the habitats. 



I never heard of the collection of the species on the Flor- 

 ida Coast by any one excepting Mr. Prime. Stimpson (Am. 

 Naturalist, IV, 587) refers to the present tropical character 

 of the shells of the west coast of Florida as being plainly 

 due to the influence of the Gulf Stream. A. pellucens , 

 whether now living or not on that coast, doubtless originally 

 owed its introduction there to the agency mentioned by 

 Stimpson. 



