1921 J Schniitt: The Marine Decapod Crustacea of California 237 



Dimensions. — Male: length, of carapace about 64 mm., width 134 mm.; im- 

 mature female 43.5 mm., width 86 mm. (Eathbun). 



Color. — Almost brown above, cream color below, the tubercles and ridges of the 

 manus tinged with red (Loekington). 



Type Locality. — Guaymas, Mexico, Gulf of California. 



Distribution.--Pomt Loma, California, to Gulf of California (Eathbun). 



Genus Portunus Fabricius 



Carapace usually broad transversely and depressed, or a little convex, often 

 with surface areolated ; front proper well delimited from inner supraorbital angles, 

 and cut into three to six, usually four teeth ; anterolateral borders oblique, arched, 

 longer than posterolateral, cut into nine teeth (including outer orbital angle), of 

 which the ninth may be enlarged. Merus of outer jnaxillipeds not markedly pro- 

 duced at antero-external angle. Abdomen of male triangular. 



Portunus xantusii (Stimpson) 



Achelous xantusii Stimpson, Ann. Lye. Nat. Hist., N. Y., 7, 222, I860 



(1862). 

 Neptunus xantusii, A. Milne Edwards, Crust. Beg. Mex., p. 213, pi. 38, 



fig. 1, pi. 39, fig. 3, 1879. 

 Portunus xantusii Holmes, Oecas. Papers Calif. Acad. Sci., 7, 71, 1900; 



Eathbun, H. A. E., 10, 179, 1904; Weymouth, Stanford Univ. Publ., 



Univ. Ser., no. 4, 49, pi. 12, fig. 35, 1910. 



Fig. 141. Portunus xantusii, <$, X %; a, dorsal view; b, ventral view of 

 abdomen (after A. Milne Edwards). 



Characters. — Carapace markedly transverse, upper surface pubescent; front 

 short, four frontal teeth equally prominent, the middle ones slightly narrower than 

 the outer pair, and separated from the latter by a slightly wider interval than 



