1921] Schmitt: The Marine Decapod Crustacea of California 225 
lighter, more yellowish tinge; the under parts are yellowish white spotted with 
red, a coloration not found in any other species of Cancer examined (Weymouth). 
Type Locality—San Francisco Bay. 
Distribution.—Queen Charlotte Sound, British Columbia, to Magdalena Bay, 
Lower California. Shallow water to 7 fathoms (Rathbun). 
Remarks.—From Weymouth (1910, p. 47) I have taken the following: 
There is considerable variation in this species and apparently a tendency 
toward two types, the extremes of which might readily be taken as a separate 
species. By far the greater number—which I would consider typical C. antennarius 
—have a smooth carapace devoid of hair except in the very young, 15 mm. and 
less in width which exhibit a few coarse hairs. A small number show a tendency 
toward hairiness and roughness of the hand, the extreme type of which is rep- 
resented by a young female, measuring 46 by 50 mm. In this the whole ecara- 
pace is densely pubescent (typical specimens of half the size show a perfectly 
bare carapace) and on the summits of the areolations, which are more marked 
than in the typical form, there are bunches of larger and stouter hairs. The 
granulations on these elevations are coarser than on the rest of the carapace, and 
in some cases pass into small spines. The anterolateral teeth do not differ 
markedly from the typical form except in being more thickened and in having 
the teeth spiny-pointed. The frontal teeth are more acute and thicker than is 
common in C. antennarius, especially those lying on either side of the median tooth, 
The tips of the basal joint and of the adjoining tooth on the lower orbital margin 
are more acute than in typical C. antennarius of the same size. 
The chelipeds and ambulatory legs are pubescent, as is the case with the 
carapace. The carpus of the chelipeds is marked with several costae bearing low 
spines and rows of hairs; these costae are generally indicated in the typical form 
by a line of slightly coarser granulations. There is an acute tubercle above the 
hinge, a strong spine at the inner angle, and a well marked spine below this. These 
spines are present in some typical C. antennarius of the same size, but the lower 
spine is more generally lacking and never of as great size. The hand is marked 
with two superior and five external carinae, all formed of rows of hairs and 
spines, the spines in the upper carinae being much longer and more pronounced. 
In typical C. antennarius of the same size these carinae are more or less well 
marked by rows of granulations. 
This specimen is, as I have said, the extreme of divergence from the typical 
form; other smaller individuals show the same pubescence, some have the same 
extreme type of areolation, notably a larger female from San Diego, the only one 
not from Monterey Bay here considered. Many young show roughness of the hand, 
but no other specimen combines as many of these characters. 
The total of these variations from the typical form of C. antennarius might 
merit specific distinction were it not for certain other facts. All specimens in 
which I have noticed these characters in any marked degree are immature females. 
Though they differ from typical forms of the same size, and therefore presumably 
of similar age, certain of the characters, chiefly the roughness of the hand and 
the pubescence of the carapace, vary with age in the typical form, being more 
apparent in the young, so that these differences though apparently much greater 
than those due to age cannot be said to be of a dissimilar kind. Again, in the 
typical adult, the female has a more convex and deeply areolated carapace than 
the male, which raises the question whether the difference in this character may 
not be, in part, sexual. _ 
Miss Rathbun has informed me that she has examined very hairy specimens 
of about the size described, 40 and 50 mm., from La Jolla and San Diego, which 
she considered as a variety of C. antennarius. Sufficient material may establish 
this variety, but the collection at hand does not seem to warrant it. 
See also Remarks under C. gibbosulus. 
Biological Survey of San Francisco Bay— Cancer antennarius, the 
‘rock erab,’’ is only recorded from the middle bay and particularly 
from that section lying between Sausalito, Fort Point, and Point 
Bonita, or in the words of Stimpson (Proe. Calif. Acad. Sci., 1, 88, 
