MELVILL : MOLLUSCA OF S. CAROLINA AND FLORIDA. 1 63 



68. O. (Birostra) uniplicata ('Sowb.) 



With the preceding, but rarer. It is significant that 

 the specimens of the species affecting the yellow Gorgonia 

 are of that colour, while those that cling to the purple 

 species are purple. 



Fain : CANCELLARID.F. 



69. Cancellaria reticulata (L.) 



Key West. Four fine specimens. 



Fam: CERITHID^. 



70. Cerithium litteratum (Born.) 



Key West. ■ Very abundant. 



71. C. mutabile (C. E. Ad.) 



One or two specimens. ^Key West. 



72. C. uncinatum (Gmel.) ? 



Key West. I am not quite sure about this name, but 

 it is the nearest approach to the specimens I found. 



73. C. (Lampania) septem-striatum (Say.) 



On the reefs at Key West — at all events on the southern 

 side. This species abounds in countless thousands. One 

 sweep of the hand on ihe rocks, or in the rock pools at low 

 water, will suffice to obtain hundreds of specimens of all 

 sizes and varieties. 



74. Bittium sp : ? 



One specimen from Sullivan's Island, South Carolina. 



75. Cerithidea crassilabrum (Ad.) 



Cedar Keys, West Florida. 



76. C. costata (Wood.) 



With the preceding. 



Fam : LITTORINID^. 



77. Littorina Sayi (Phil.) 



Cedar Keys, West Florida — quite away from the sea, 



