DEC APOD A. 



BRACHYURA. 



LEPTOPODIADM. 



GENUS INACHUS, FABB. 



CANCER, 

 INACHUS, 

 MACROPUS, 

 MAIA, 



Pennant, Herbst. 



Fabr. Leach, Latr. Edw. 



Latr. 



Bosc. 



Generic character. External antennce not more than one-fifth 

 of the length of the body ; the basal joint forming the inferior 

 margin of the orbit ; the second inserted by the side of the rostrum. 

 External pedipalps with the second joint much produced internally ; 

 the third joint elongate, somewhat triangular, the anterior and 

 inner angle truncate at the insertion of the palp, which is three- 

 jointed. The anterior legs, in the male, twice as long as the body, 

 the arms and the hands subovate, the fingers inflected. The re- 

 maining pairs very long, diminishing in length from the second to 

 the fifth ; second pair larger than the succeeding ones ; the terminal 

 joint long and slightly curved. Carapace subtriangular, nearly as 

 broad as long, the rostrum short and bifid. Eyes on short foot- 

 stalks, retractile or capable of being bent backwards and lodged in 

 the posterior part of the orbit. Abdomen in both sexes, six-jointed 

 and carinated, 



