1921] Schmitt: 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. (Rathbun). 
Color.—Almost brown above, cream color below, the tubercles and ridges of the 
manus tinged with red (Lockington). 
Type Locality—Guaymas, Mexico, Gulf of California. 
Distribution.—Point Loma, California, to Gulf of California (Rathbun). 
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 maxillipeds 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, 1860 
(1862). 
Neptunus xantusii, A. Milne Edwards, Crust. Rég. Mex., p. 213, pl. 38, 
fig; pl. 39; fig. 3,, 1879; 
Portunus xantusii Holmes, Occas. Papers Calif. Acad. Sci., 7, 71, 1900; 
Rathbun, H. A. E., 10, 179, 1904; Weymouth, Stanford Univ. Publ, 
Univ. Ser., no. 4, 49, pl. 12, fig. 35, 1910. 
a b 
Fig. 141. Portunus zantusii, J, 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 
