Note on certain Terrestrial Mollushs. 197 



XXI. — Notes on certain Terrestrial Mollushs, with descrip- 

 tion of a New Species of the Genus Amphibulima. 



By THOMAS BLAND. 

 Read October 11th, 1875. 



Helix Sagemon, Beck. (Caracolus). 



In former papers (Annals XI, 81 and 148) I mentioned 

 the receipt from Haiti of dead specimens of H. bizonalis, 

 Desh., and referring to H. GasJcoini, Pfr., of Santo Domingo, 

 remarked as follows : " looking at the variability of H. Sag- 

 emon of Cuba, I am much inclined to consider that H. Gas- 

 Jcoini is a variety of bizonalis." I am now indebted to 

 Professor Linden of Buffalo, for several living specimens, 

 collected by himself on Gonave Island, of a species not only 

 very closely allied in every respect to, but I believe identical 

 with the variety of //. Sagemon, described as II. Arangiana 

 by Poey.* , 



The Gonave shells differ only from a Cuban specimen of 

 Arangiana, received from my friend Don Rafael Arango, iu 

 having a white instead of a. reddish brown peristome. 



Seeing that this Cuban form belongs also to the Haitian 

 fauna, and comparing II. GasJcoini with varieties of H. Sag- 

 emon, I am led to the conclusion that the former belongs to 

 the latter group, and is not a variety of bizonalis. Indeed 

 H. GasJcoini is strikingly similar to H. marginelloides, Orb., 

 as figured by Pfeiffer (Nov. Conch, taf., XCI, figs. 9 and 

 10). 



I submitted the animal of the Gonave shell to my friend 

 W. G. Binney, who examined that of the Cuban Arangiana 

 received from Arango. Binney reported that in jaw and 

 dentition they agree, but the former has an outer small cut- 



* Poey, in his Introduction to the Catalogue of Land and Fresh Water Mollusks of 

 Cuba, by Arango (Kepertorio I, 71), acquiesces in placing Arangiana aud other allied 

 species in the synonymy of Sagemon. 



