152 University of California Publications in Zoology (Vou. 23 
Genus Acantholithodes Holmes 
Carapace flattened and hispid with numerous short setose spines. Chelipeds 
and ambulatory legs armed with numerous similar though larger and stronger 
spines. Basal (second) and two terminal abdominal segments stiffened by thin 
calcareous plates, remainder of abdomen membranous. 
Acantholithodes hispidus (Stimpson) 
Plate 19, figure 2 
Dermaturus hispidus Stimpson, Ann. Lyc. Nat. Hist. N. Y., 7, 242, 1860; 
Bouvier, Ann. Sci. Nat. (7), 18, 174, pl. 11, figs. 3, 16, pl. 12, figs. 2, 16, 
31, 1895. 
Acantholithodes hispidus Holmes, Proce. Calif. Acad. Sci. (2), 4, 575, 1895; 
Occas. Papers Calif. Acad. Sci., 7, 120, 1900. 
Fig. 98. <Acantholithodes hispidus, outline of ¢ (after Bouvier). 
Characters.—Rostrum prominent and terminated by strong spines. Branchial 
regions of carapace with a slight depressed area; between cardiac and gastric 
regions there is quite a sharp, narrow cleft. Abdomen, short, broad, and soft; 
integument spiny, spines not so large as on carapace; on basal (second) segment 
a median plate, two wide lateral plates and two narrow marginal ones; the plate 
on the penultimate segment is oblong; the last one, representing the telson, is 
small, rounded, and about as long as wide. 
Dimensions.—Type, female: length of carapace 21.6 mm., width anteriorly. 
10.9 mm., posteriorly 22.9 mm. Of a specimen examined by Holmes, length of 
carapace from tip of rostrum 58 mm., width of carapace 56 mm. 
Color.—Fingers bright red, with white tuberculiform teeth, and black horny 
tips, rest of body yellow, except hands, which are suffused with tinge of red from 
fingers (Stimpson). 
Type Localityx—Monterey Bay, California, from stomachs of fishes. 
Distribution.—Off Moorovskoy Bay, Alaska (‘‘Albatross’’ station 3319), to 
Monterey, California, to a depth of 73 fathoms. 
Biological Survey of San Francisco Bay.—There is one specimen 
of Acantholithodes hispidus in the collection without a label, but it 
