1921] Schmitt: The Marine Decapod Crustacea of California 247 
Xanthias latimanus (Lockington) 
Xanthodes latimanus Lockington, Proc. Calif. Acad. Sci., 7, 31, 1877. 
Xanthias latimanus Holmes, Oceas. Papers Calif. Acad. Sci., 7, 66, 1900; 
Rathbun, H. A. H., 10, 185, 1904. 
Characters.—Carapace but slightly transverse; front sinuate, inner angle 
of orbit raised into a point. Hands of chelipeds subequal, the right somewhat 
the larger; movable fingers very long and curved abruptly downward; margin of 
hand continuous with the broad base of the fixed finger so as to form a sinuous 
sloping line. 
Dimensions.—Type, male: length 18.5 mm., width 22.4 mm. 
Type Locality—San Diego, California. Not seen since Lockington’s record. 
Remarks.—This species may readily be identified by the delicate marbling of 
the carapace and chelipeds, and the downward bend of the movable fingers (Lock- 
ington). 
Genus Pilumnus Leach 
Carapace transversely oval or subquadrilateral, not greatly broader than long; 
front usually about a third the greatest width of the carapace, sometimes broader, 
cut into two lobes, the outer angle of each of which commonly forms an indepen- 
dent dentiform or spiniform lobule, separated from supraorbital angle by a groove 
or notch; orbits generally have a gap or fissure just below outer angle and one 
or two gaps or notches in upper border; anterolateral margins not longer than 
the posterolateral, commonly shorter, and cut into teeth which very commonly 
are spiniform; fronto-orbital border much more than half the greatest width of 
the carapace. Ambulatory legs generally covered thickly with hair, not carinated, 
usually stout, and of moderate length. Abdomen of male seven-jointed. 
Pilumnus spinohirsutus (Lockington) 
Plate 37, figure 10 
Acanthus spino-hirsutus Lockington, Proe. Calif. Acad. Sci., 7, 32 and 102, 
1876 (1877). 
Pilumnus spino-hirsutus Holmes, Occas. Papers Calif. Acad. Sci, 7, 67, 
1900. 
Pilumnus spinohirsutus Rathbun, H. A. E., 10, 185, pl. 7, fig. 2, 1904. 
Characters.—Carapace strongly convex, nearly smooth, but covered with stiff 
setae; median frontal lobes truncated, separated by a prominent notch, each 
armed with four or five spines; lateral lobes of front small, separated from the 
median lobes by a deep notch and ending in a spine; orbits with upper, lower 
and outer margins armed with strong spines of unequal size, the two spines at 
the intero-inferior angle large and situated on a kind of lobe; besides the post- 
orbital the anterolateral margin is armed with three strong spines in front of the 
first of which is a small spine below the margin. Chelipeds unequal, setose; carpus 
with outer surface thickly covered with spines; upper and outer surface of hand 
eovered with several series of spines, lower margin finely denticulated, fingers 
dark colored. 
Dimensions.—Type: length 25.4 mm., width 28.4 mm. 
Color.—One peculiarity of this form is the bright red tint of the prominent 
transverse ridge in front of the buccal area (Lockington). 
Type Locality—San Diego, California. 
Distribution Venice to San Diego, California, and Gulf of California; 10 to 
22 fathoms (Rathbun). Bay of St. Elena, Ecuador (Nobili). 
