Notes on Certain Terrestrial Mollusks. 81 



Newconib. It agrees entirely with Pfeiffer's description 

 (Zool. Proc., 1851) and with Reeve's figure. 



Helix bizonalis, Desh. 



Several years ago Mr. Ferguson found on logwood brought 

 to the Port of New York, two specimens of a shell allied in 

 form to H. marginella, Gmel. of Puerto Rico ; with them were 

 examples of H. crispata Fer. , an indication that the logwood 

 was from Haiti. One of the specimens is still in my posses- 

 sion, the other in the Swift Cabinet. 



Dr. Newcomb collected one fresh example when crossing 

 the eastern end of the Island ; the shell was sent to me for 

 examination and found to be similar to that had from Mr. 

 Ferguson. 



In 1872 I received another (dead) specimen from Mrs. 

 Wm. Klatte, found near Port au Prince, with IT. crispata. 



The Ferguson shell was compared in 1871, by Mr. Sow- 

 erby, in the British Museum, and agreed with specimens 

 there labelled H. bizonalis, Desh. 



In 1873 my specimens were examined by Salle with the 

 type of H. bizonalis in the collection of Deshayes, and pro- 

 nounced identical with it. 



Deshayes (Fer. Hist. I, 68, N. 90) has, in the synonymy 

 of the species, H. marginata, Var. Fer. Hist., t. 63, f. 11- 

 12, which figures certainly agree with bizonalis. 



Deshayes does not give the habitat of bizonalis; in Chem. 

 ed. 2, N. 956, the species is attributed, apparently on the 

 authority of specimens in Cuming's Cabinet, to Manila, but 

 undoubtedly it belongs to Haiti. Looking at the variability 

 of H. Sagemon of Cuba, I am much inclined to consider 

 that H. Gashoini is a var. of bizonalis. 



The occurrence of the nearly allied forms of Sagemon in 

 Cuba, bizonalis in Haiti, and marginella in Puerto Rico, is an 

 interesting fact. The connection of the faunas of the two 

 latter Islands is strikingly shown by the prevalence of forms 



