224 University of California Publications in Zoology [VoL 23 
Cancer antennarius Stimpson 
Plate 35, figure 3; plate 36, figure 8 
Cancer antennarius Stimpson, Proc. Calif. Acad. Sci., 1, 96, 1856; Jour. 
Boston Soc. Nat. Hist., 6, 466, 1857; Rathbun, R., The Fisheries and 
Fishery Industries of the U. 8., sec. 1, p. 771, pl. 263, 1884; Holmes, 
Oceas. Papers Calif, Acad. Sci., 7, 49, 1900; Rathbun, H. A. E., 10, 
176, 1904; Weymouth, Stanford Univ. Publ., Univ. Ser., no. 4, 47, 
pl. 10, fig. 31, pl. 11, fig. 32, 1910. 
Fig. 137. Cancer antennarius, X about % (after R. Rathbun). 
Characters.—Carapace smooth, widest at eighth anterolateral tooth, eleventh 
(really the second posterolateral) tooth distinct; fronto-orbital width one-third 
the width of the carapace; front not produced, the three median teeth separated 
from the outermost pair, which is the largest, middle tooth smaller and rather 
below the lateral ones. Merus of outer maxillipeds with distal margin nearly 
transverse, angles rounded. Carpus of chelipeds with a single spine above, at 
distal end; outer surface of hand costate, costae well marked in the young, almost 
obsolete in the adult; dark color on the fingers of the chelipeds, reaching more 
than one-half the length of the outer margins. Under parts spotted or blotched 
with reddish. Dactyls of ambulatory legs with eight longitudinal sulci, three 
superior, three inferior, one anterior, and one posterior. 
Dimensions.—Types, male: length of carapace 61.7 mm., width 94 mm.; female: 
length of carapace 54.1 mm., width 78.2 mm. The Bay specimens ranged from 
8 to 57 mm. in width. 
Color.—Color of live specimens is fairly uniform and undergoes little change in 
alcohol. The general shade is a dark red, usually more or less mottled with a 
