174 THE BERMUDA ISLANDS. 



Cerithium ferrugineum, Say. 



C. versicolor, Adams. 

 C. Bermudas, Sowb. 

 (7. Eriense, Val. 

 Florida, W. Indies. 



Cerithium, sp. ? 



A form apparently closely related to Cerithium diadema, 

 Watson, from Madeira. 



Potamides minimus, Grnel. 



P. nigrescens, Menke. 



P. alboviUatue, Adams. 



?P. zonale (in part), Drug. 



E. United States, W. Indies, Europe. 



Triforis turris-Thomae, Chemn. 



St. Thomas. 



Triforis inter medius, Adams. 



St. Thomas. 



Bissoina crassicostata. Adams. 



St. Thomas. 



Rissoina Sagraiana, D'Orb. 



St. Thomas. 



Rissoina micans, Adams, in Jones's list 



Hydrobia 1 



Nerita peloronta, L. 



W. Indies. 



Nerita tessellata, Gmel. 



W. Indies. 



Nerita versicolor, Gmel. 



Florida, W. Indies, Costa Rica. 



Neritina viridis, L. 



W. Indies, Lancerote, Mediterranean. 



