DECAPODS 177 
siderably the basal joint of the antennze; merus longer than wide. The 
palms of the chelipeds have 2 superior and 5 external carine fringed 
with hair. On the prehensile edges of the fingers the dark color runs 
from the proximal end of the fingers nearly to the tip, but on the outer 
edges the dark color begins near the middle of the fingers. 
Dimensions.—Female, length 15.5 mm., width 19.5 mm., length of 
movable part of antenna 7.5 mm., fronto-orbital width 9g mm. A male 
is about 20 mm. long, but too damaged for measurement. 
Distribution.—Monterey Bay, California (Harold Heath), one under 
rocks between low tide mark and mean tide, and three from the sub- 
umbrella space of a large violet-and-white jellyfish (type locality, Cat. 
No. 22,868). Young specimens were taken by John C, Brown at Pacific 
Grove, and by H. N. Lowe at San Pedro, California. 
Relations.—This species may have been confounded with the young 
of better known species. The young of C. magister has a nearly naked 
carapace, the ninth tooth of the lateral margin is produced sideways, the 
antenne are less than twice as wide as front, the merus of the maxilli- 
peds is no broader than long, the carine of the upper and outer surfaces 
of the hand are 6 instead of 7. 
The carapace of young C. antennarius is also nearly naked (Dr. Holmes 
may have had in his hand C. gibdosulus when he described the carapace 
of young C. antennarius as thickly covered with hair); the teeth are all 
much thickened, the orbital teeth prominent, the two underneath being 
rounded, not sharp; the maxillipeds reach only to the base of the anten- 
nal segment, the merus not broader than long; the dark color on the 
fingers is more extensive than in C. jordani. 
Cancer gibbosulus has a much more uneven carapace, strongly marked 
and rounded orbital teeth, a postero-lateral tooth, ninth tooth more 
prominent than eighth. Carapace hairy, as in C. jordani. 
In C. anthonyi the antero-lateral teeth are low and broad, not alter- 
nately large and small, the first 6 having blunt angles; the inner supra- 
orbital tooth is well developed. 
CANCER MAGISTER Dana. 
Harriman Expedition.—Berg Bay, Glacier Bay. 
Distribution.— Unalaska to Magdalena Bay, Lower California. Low 
water to 50 fathoms. 
CANCER GRACILIS Dana. 
Distribution.—Kasaan Bay, Prince of Wales Island, Alaska, to Playa 
Maria Bay, Lower California. Shallow water to 56 fathoms. 
