80 Notes on Certain Terrestrial Mollushs. 



approximating, right margin somewhat expanded, colnmellar margin 

 much dilated above, reflected, nearly covering the perforation, basal mar- 

 gin with a lamelliform callus within. Diam. maj. 15; min. 13 mill. ; alt. 

 8 mill. 



Habitat. Little Inagua, Bahamas. 



Remarks. This in general form is much like H. Duclosi- 

 ana, Fer., but the interior projecting tooth is wanting and the 

 callus on the basal margin is more developed. 



The species belongs to the subgenus PlagioptycJia, which 

 is peculiarly characteristic of the Haitian fauna. I have else- 

 where remarked (Annals X, 318) on the evidences of the 

 former more intimate connection of Inagua and Turks Islands 

 with Haiti. I name the species after Mr. Daniel Sargent of 

 Inagua, to whom I am indebted for many interesting shells 

 from the Bahamas. 



Helix marginella, Gmel. (Caracolus). 



In the Swift Cabinet there are specimens from Mayaguez, 

 Puerto Rico, in which the dark band almost covers the upper 

 whorls, leaving simply a narrow lighter colored margin next 

 the sutures ; the dark band equally wide at the base. There 

 is also an albino specimen, which was found in 1864, by the 

 late Mr. Haagenson in a wood, on San Isidio Estate, near 

 the city of San Juan. 



This species occurs in Vieque and Culabre as well as in 

 Puerto Rico. 



Helix Gaskoini, Pfr. (Caracohis). 



M. Salle first collected this in St. Domingo. He noticed, I 

 learn from him, many specimens, but all appearing dead and 

 white, collected two only, one of which remains in his Cab- 

 inet, the other iu Cuming's. 



Professor Gabb found specimens during his explorations 

 iu St. Domingo, and one of them was given to me by Dr. 



