no.1750. ON SOME OftTRACODA, UOSTTA \EW SITARPE. 341 



It is interesting to note that all hut one of these species are to he 

 found in the Western Continent, and of these the majority are from 

 South America. 



('. barbadensis differs from all other species of the genus known to 

 the writer in the following particulars: First, in me other is known in 

 he sexual: second, the quite pellucid shells of alcoholic specimens; 

 third, the greater or less tendency of the dorsal spinules of the furca 

 toward a comb-like arrangement (fig. 5/); fourth, it is the largest of 

 any reported except C. <>l>/i<]iui. from Patagonia. 



