286 CRUSTACEA. 



Caldera, Island of Mindanao, Philippines. 



Length of carapax, one inch three and one-fourth lines ; breadth, 

 one inch and ten lines; ratio of length to breadth, 1 : 1-5. The prje- 

 orbital lobe is hardly broader than the second frontal lobe. The 

 crest of the basal joint of the outer antennae is short, rounded, entire, 

 or nearly so. The second tooth of the antero-lateral margin is a part 

 properly of the first tooth, a part cut from its posterior side. This 

 species differs from the G. anisodon, De H. (F. Jap., 42), in not having 

 the posterior of the lateral teeth larger than the others. 



CHARYBDIS CRUCIFERA. 



Plate 17, fig. 11 a, outline of carapax of a young individual, natural 

 size ; b, hand of same ; c, summit of inner branch of first pair of max- 

 illipeds. 



Singapore, East Indies. 



Length of the carapax of a male, two inches two and a half lines ; 

 breadth, three inches two and a half lines ; ratio, 1 : 1'46. In the 

 specimen supposed to be young of the crucifera, the carapax is short 

 pubescent, and the last tooth is half longer than the others. The pro- 

 portions are the same as in the large specimens, the length of the 

 carapax being thirteen lines ; breadth between tips of posterior teeth, 

 nineteen lines ; ratio of length to this breadth, 1 : 146 ; breadth be- 

 tween tips of next teeth anterior, seventeen and a half lines ; ratio of 

 length to this breadth, 1 : 1'35. 



Portunus crucifer, FABR., Suppl., 364. 

 Thalamita crucifera, EDWARDS, Crust., i. 462. 

 Oceanus crucifer, DE HAAN, Crust., Faun. Japon., 40. 



CHARYBDIS AFFINIS, Dana. 



Plate 17, fig. 12 a, front, natural size; b, outer view of larger hand; 

 c, part of inner branch of first maxillipeds. 



Singapore. 



