Part 2.— THE CYCLOPHORID MOLLUSKS OF THE 

 WEST INDIES, EXCLUSIVE OF CUBA 



By Paul Baktsch 



Family CYCLOPHORIDAE Gray 



For a definition of the family, see p. 3. 



KEY TO THE ANTILLEAN SUBFAMILIES OF THE FAMILY CYCLOPHORIDAE 



Shell elongate-turrited Megalomastominae 



Shell not elongate-turrited. 



Shell pupoid Diplommatininae 



Shell not pupoid, but planorboid or helicoid. 



Operculum ehondroid Amphicyclotinae 



Operculum calcified Aperostominae 



Subfamily Megalomastominae Torre and Bartsch 



Cyclophorid mollusks having an elongate-conic or elongate-turrited 

 shell. Operculum corneous. 



For complete diagnosis, see p. 3. 



KEY TO THE WEST INDIAN GENERA OF MEGALOMASTOMINAE 



Shell large and robust. 



Whorls of operculum fused Farcimen 



Whorls of operculum distinct rarcimoides 



Shell not large and robust, but small and thin Megalomastoma 



Genus FARCIMEN Troschel 



For diagnosis of the genus, see p. 4. 



The subgenus Farcimen is restricted to the island of Cuba and is 

 therefore not considered in this part of our paper. 



Subgenus Neopupina Kobelt 



1854. Megaloma Woodward, A manual of the MoUusca, p. 177 (not Megaloma 



Hall, 1852). 

 1856. Lomastoma Woodwakd, ihid., p. xviii (not Rafinesque, 1819). 

 1902. Neopupina Kobelt, Das Tierreich, Cyclophoridae, p. 262. 



This subgenus differs from the Cuban Farcimen in having a more 

 cylindric shell and in having the peristome sharp, i. e., not broadly 

 thickened and reflected. Operculum a thin ehondroid multispiral 

 plate. 



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