272 CRUSTACEA. 



anterior legs with a large crimson spot on the inside of the moveable 

 finger. 



Cancer sanguinolentiis, HERBST, i. 161, pi. 8, f. 56, 57. 



Lupa sanguinolenta, DESMAREST, Crust., 99 ; EDWARDS, Crust., i. 451, and Cuv., pi. 

 10, f. 1. 



Neptunus sanguinolenlus, DE HAAN, Faun. Japon., 38. 



LUPA DICANTHA (Latreille). 



Plate 16, fig. 7 a, abdomen of male, natural size ; 6, under view, 

 showing mouth with part of the maxillipeds removed e, the anterior 

 margin of the praelabial plate mx, inner branch of first maxillipeds 

 md, mandibles r, ridge on praelabial plate ; c, outer maxilliped. 



Rio Janeiro. 



Length of carapax of a male, two inches ; breadth between tips of 

 long lateral spine, four and one-half inches ; ratio of length to this 

 breadth, 1 : 2'25 ; breadth between the tips of the teeth next anterior, 

 three inches and seven lines ; ratio of length to this breadth, 1:2-1. 

 In the same male, the breadth of the second joint of the abdomen is 

 seventeen lines, and that of the fourth, which is linear, hardly two 

 lines, making the ratio between the two, 1 : 9. The third joint of the 

 outer maxillipeds is oblique subtriangular, the outer side being con- 

 cave in outline, the inner obliquely truncate and convex, and not at 

 all projecting just above the articulation with the next joint, but 

 continuing in an uninterrupted line curving around to the outer apex. 

 The colour of this species as observed at Rio Janeiro, is olive green, 

 with the eight posterior legs in part bluish, and the arm and hand 

 blue, with some reddish purple. 



After a close examination of the two varieties of this species, the 

 Brazilian with the median teeth of the front prominent and the other 

 with them obsolete, we incline to the opinion, that they are distinct 

 species, and that therefore, the L. liastata of Say will stand as a good 

 species under his name; yet we cannot pronounce with certainty 

 upon this point. The Lupa hastata of other authors is an Amphitrite. 



Porlunus dicanthus, LATREILLE, Encyc., x. 190. 

 Lupa hastata? SAY, J. Acad. Nat. Sci. Philad., i. 65. 

 Lupa dicantha, EDWARDS, Crust., i. 451. 



