CANCROIDEA. 



LUPA Sayi, Gibbes. 



Plate 16, fig. 8, abdomen of male, natural size. 



Gulf weed, Atlantic Ocean. 



Length of carapax of a male, fourteen and a half lines ; breadth 

 between tips of long lateral spines, twenty-eight and a half lines ; 

 ratio, nearly 1:2; breadth between teeth next anterior, twenty-four 

 lines; ratio, 1:1*66. This is proportionally a much less broad spe- 

 cies than the L. dicaniha. The arm has not the spine at its poste- 

 rior apex characteristic of that species. The male abdomen is much 

 broader along its fourth joint, its breadth here being greater than 

 one-fourth its basal breadth. The third joint of the outer maxilli- 

 peds is much less oblique, and broader at its anterior margin. The 

 four medial of the frontal teeth are very nearly equal. The costae of 

 the hand are very nearly smooth, and the fingers of neither hand 

 have any broad, rounded teeth near base. There are four spines on 

 the anterior margin of the arm, instead of three as in 'the dicantha; the 

 pterygostomian regions are pubescent, while they are naked or nearly 

 so in the dicantha. 



Portunus pelagicus, Bosc, Hist. Nat. des. Crust., i. 220, tab. 5, f. 3. 

 Lupa pelagica, Say, Jour. Acad. Nat. Sci. Philad., i. 97; Dekay, Zool. N. Y., 

 Crust., p. 11, pi. 6, f. 8. 



Lupa Sayi, L. R. Gibbes, Proe. Amer. Assoc, 1850, at Charleston, p. 178. 



Lupa spinimana, Leach. 

 Rio Janeiro, Brazil. 



Length of carapax of a male, one inch eight and a half lines ; 

 greatest breadth, two inches and ten lines; ratio, 1 : 1*66. This 

 species has the carapax covered with a short brownish down, except 

 along certain lines and areolets. The medial areolet is often bare in 

 its anterior part (prsemedial areolet) ; also the extra-medial, ante- 



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