582 Monograph of the Genus CalUnectes. 



Janeiro, which, as we have shown, is distinct from any of 

 those of the United States coast. Dana, however, makes 

 it synonymous with the L. dicantha of Mihie-Edwards, 

 and Portumis diacanthus of Latr. But the P. diacant/ivs, 

 as I have already shown, is a Neplumis. I retain the 

 name diacanthus for the Brazilian species, though it is 

 probably not the dicantha of Milne-Edwards. 



De Saussure, in his " Crust, de la Mexique," etc., con- 

 founds all of the species of CalUnectes of the eastern coast 

 together, though he thought that there was a great varia- 

 tion in them. He mentions in particular a female from 

 Cuba with a very convex carapax, and the teeth of the 

 front equal, which may be our C. tumidus. He calls them 

 all L. diacantha. 



Stimpson, in his "Notes on North American Crustacea, 

 No. 1," mentions, under the name of L. hellicosa, the first 

 CalUnectes, in fact the first Portunid, discovered on the 

 western coast. 



In his second number he institutes with good reason the 

 genus CalUnectes. But unfortunately, from want of suffi- 

 cient material, he does not correct the errors of previous 

 authors, but expresses himself as " unable to find constant 

 di (Terences between the northern and southern varieties of 

 this species," and also regards the species of the western 

 coast as identical with it. 



Our materials have been large, and we have spent much 

 time in investigating them, being actuated solely by a de- 

 sire to arrive at the truth, and we think that all of the spe- 

 cies that we have indicated are truly distinct. The char- 

 acters which separate them do not vary, and there is no 

 gradual passage from one species to another. Differences 

 in organs of such importance as those of generation, and 

 so marked as those we have pointed out, are certainly 

 reliable. 



All species of CalUnectes exhibit a singular resemblance 



