236 



University of California Publications in Zoology [ VoL - 23 



Family Portunidae 



Carapace moderately transverse, usually widest at last anterolateral marginal 

 tooth; front with or without median tooth. Antennules fold back transversely or 

 obliquely. Third maxillipeds not overlapping endostome. Ambulatory legs flat- 

 tened, and more or less distinctly adapted for swimming. 



Key to the California Genera of the Portunidae 



I. Abdomen of male j_ shaped. Merus of outer maxillipeds prominent, and 



curved outward at the antero-external angle. (Not known north of Point 



Loma.) 



Callinectes, p. 236. 



II. Abdomen of male triangular. Merus of outer maxillipeds not markedly prom- 

 inent at antero-external angle, more or less obtuse. 



Portunus, p. 237. 



Genus Callinectes Stimpson 



Abdomen of male very narrow, X shaped; merus of outer maxillipeds strongly 

 produced outwardly at antero-external angle. Otherwise very similar to Portunus. 



Callinectes bellicosus (Stimpson) 



Lupa bellicosa (Sloat MS.) Stimpson, Ann. Lye. Nat. Hist. N. Y., 7, 57, 

 1859 (1862) ; Lockington, Proc. Calif. Acad. Sci., 7, 105, 1877. 



Callinectes bellicosus Rathbun, Proc. U. S. Nat. Mus., 18, 365, pis. 22, 24, 

 fig. 10, pi. 25, fig. 8, pi. 26, fig. 8, 1895; H. A. E., 10, 180, 1904. 



Pig. 140. Callinectes bellicosus, slightly enlarged: 

 b, frontal outline (after Rathbun). 



a, abdominal outline of $; 



Characters. — Carapace minutely granulated; front with two slender, sharp 

 teeth, widely separated, and between them two very faintly marked median teeth; 

 inner supraorbital fissure open, often throughout its length ; postorbital tooth long, 

 exceeding preorbital. Carpus of chelipeds with two or three external ridges and 

 a few pointed tubercles near the anterior end; hand with a strong spine above the 

 upper hinge joint, at the proximal end of a tuberculated costa; ridge on the 

 posterior upper edge ending distally in a spine; fingers obscurely if at all ridged 

 on outer face. 



