THE CANCROID CEABS OF AMERICA 121 



Parana: Paranagua; October 3, 1925; W. L. Schmitt; 2 youcg (60986). 

 State of Santa Catharina: Saco Sao Francisco, 1923, Dr. C. Fernetz, 

 2 males, 1 female, lent by Buenos Aires Museum. 1925, W. L. 

 Schmitt: Praia Inglese, Sao Francisco, November 1, 1 male (60989); 

 Florianopolis, Praia de Fora, November 5, 1 male, 1 female, 1 young 

 (60985). 



CALUNECTES ARCUATUS Ordway 



Plate 52 



Callinectes arcuatus Ordwat, Journ. Boston Soc. Nat. Hist., vol. 7, 1863, p. 



578 [13] (type-locality, Cape St. Lucas; type, Cat. No. 61833, U.S.N. M.— 



A. Milne Edwards, Crust. Reg. Mex., 1879, p. 228 (var. of C. diacanthus). — 



Rathbun, Proc. U. S. Nat. Mus., vol. 18, 1895 (1896), p. 362, pi. 20; pi. 23, 



fig. 1; pi. 24, fig. 8; pi. 25, fig. 7; pi. 26, fig. 7; pi. 27, fig. 7. 

 Callinectes pleuriticus Ordway, Journ. Boston Soc. Nat. Hist., vol. 7, 1863, 



p. 579 [14] (type-locality, Panama; cotypes. Cat. No. 4701, M.C.Z.).— A. 



Milne Edwards, Crust. Reg. Mex., 1879, p. 228 (var. of C. diacanthus). 

 Callinectes species Smith, Third Ann. Rept. Peabody Acad. Sci., 1869 (1871), 



p. 91, Gulf of Fonseca. 

 Callinectes duhia Kingsley, Proc. Boston Soc. Nat. Hist., vol. 20, 1879, p. 156 



(type-locality, Gulf of Fonseca, west coast of Nicaragua; type, Cat. No. 



5178, M.C.Z.) . 

 Callinectes nitidus A. Milne Edwards, Crust. Reg. Mex., 1879, p. 228 (var. of 



C. diacanthus) (type-locality, Tanesco, on the l:)orders of the Est6ros, 



Guatemala; cotypes in U.S.N. M. (20269) and Paris Mus.).— Rathbun, 



Proc. U. S. Nat. Mus., vol. 18, 1895 (1896), p. 366. 

 Callinectes diacanthus var. C. nitidus A. Milne Edwards, Crust. Reg. Mex., 



1879, explanation of pi. 41. 

 Callinectes diacanthus A. Milne Edwards, Crust. R^g. Mex., 1879, pi. 41. 



Diagnosis. — Penult segment of male abdomen mostly with parallel 

 sides; appendages about reaching terminal segment. Frontal teeth 

 narrow. Antero-lateral teeth chiefly with convex margins, lateral 

 spine longish. 



Description. — Carapace very convex, finely granulate, granules 

 very numerous in the median region. Length of intramedial area 

 about one-half its anterior width and much less than its posterior 

 width; length greater than in C. danae. Front with four stout tri- 

 angular blunt teeth with concave sides, the middle pair about one- 

 third the size of the outer pair; subfrontal spine produced well beyond 

 the lateral frontal teeth. Suborbital tooth rounded. Antero-lateral 

 margin very arcuate; teeth large, well separated, their posterior 

 longer than their anterior margins, the first four or five teeth with 

 more or less convex margins and subacute tips, the succeeding ones 

 becoming regularly sharper and more spiniform. Lateral spine 

 about two and a half to three times length of adjoining tooth. Costae 

 of manus coarsely and closely granulate. Spine at extremity of 

 outer carina of carpus well developed. Penultimate segment of 

 male abdomen broad at base, but for the greater part of their length 

 the margins are subparallel. The appendages of the first segment 



