op coNonoLOQY. 359 



HELICEA. 



Pineria, Poey 



Bealhina, Poey. 

 Leucochila * 



fallax, Say. 

 Strophia, Alb * 



mumia, Brug. 

 Ennea, H. & A. Ad 



bicolor, Gould. 

 Streptaxis, Gray 



eontusu8, Fer. 



F. SUCCINEA. 



Simfulopsis, Beck 



sulculosa, Fer. 

 Succinea, Drap. 

 Amphibulima,CLam.) Blainv. 

 patula, Brug. 



Succinea, s. str * 



obliqua, Say. 



Brachyspira, Pfr * 



tigrina, Lesueur. 



Omalonyx, Orb 



unguis, Fer. 



In the following pages I offer a more detailed description of 

 the peculiar features of the distribution of the inoperculates, 

 in the different West Indian subprovinces. 



1. Cuba, the Isle of Pines, the Bahamas and Bermudas. In 

 this subprovince there are very many peculiarly West Indian 

 forms. The subgenera of Helix most characteristic of Cuba 

 are : Uurycampta (H. Bonplandi, Lam.), Cory da (H. alauda 

 Fer.), Thelidomus (H. auricoma, Fer.), Polymita (H. muscarum, 

 Lea), Polydontes {H. imperator, Montf.), and Caracolus (ff. 

 Sagemo?t, Beck). In the Bahamas, Plaqioptycha, which belongs 

 rather to Haiti, is represented by H. Bahamensis, Pfr., and 

 other species. 



Liguus (L.fasciatus, Mull.), found also in Florida and the 

 adjacent Keys, confined in the Islands to Cuba and Haiti, has 

 most species in the former. Several of the subgenera of 



