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GENUS CORYSTES. 



The present genus forms a very obvious approach to the 

 division of the Anomoura of Edwards. Its deviations from 

 the typical Brachyura are numerous and striking, and 

 consist in the general form of the body, the relations of the 

 buccal opening, the external pedipalps, the epistome, and 

 the arrangement of the first joints of the abdomen, and the 

 posterior pair of legs. There is, at present, but one species 

 of the genus known ; but it has a very nearly allied repre- 

 sentative in the new world, the Pseudocorystes armatus of 

 Edwards, discovered by M. Guy on the coast of Valparaiso, 

 and found by Mr. Cuming and by Mr. Darwin in the 

 same locality. 



