228 University of California Publications in Zoology (Vou. 23 
or granulated, without spines; dark color on fingers of chelipeds reaching less than 
half the length of the outer margins. Under parts uniform light color. Lower 
surface and legs less hairy than in C. antennarius. Dactyls of ambulatory legs 
with six longitudinal sulci, two superior, two inferior, one anterior, and one 
posterior. 
Dimensions.—A male somewhat larger than the type measures 52.1 mm. long 
and 77.5 mm. wide (Rathbun). 
Color.—Brownish red (Rathbun). 
Type Locality—lLong Beach, California. 
DistributionLong Beach, California, to Playa Maria Bay, Lower California. 
Cancer jordani Rathbun 
Plate 36, figures 5 and 6 
Cancer jordani Rathbun, Amer. Nat., 34, 133, 1900; H. A. E., 10, 176, 
pl. 6, fig. 4, 1904; Weymouth, Stanford Univ. Publ., Univ. Ser., no. 4, 
45, pl. 10, fig. 30, 1910. 
Characters.—Carapace slightly areolated, hairy; anterolateral teeth separated 
to their bases, tips spiniform, second, fourth, sixth and eighth smaller than the 
others (outer orbital tooth being counted as the first) ; alternation in size of teeth 
varying with age, most noticeable in young specimens, less so in large ones, ninth 
tooth scarcely more prominent than eighth, tenth tooth (really posterolateral) 
indicated in older specimens and less conspicuously in younger ones by a slight 
gap in the small spines marking the posterolateral margin of the carapace; fronto- 
orbital width nearly one-half the width of the carapace. Merus of outer maxilli- 
peds obliquely truncated, the inner angle the more advanced, corners rounded. 
Palms of the chelipeds have two superior and five external carinae, fringed with 
hair, superior carinae also with several spines; movable finger not spiny; extent 
of dark color on fingers of chelipeds variable. 
Dimensions.—Type, female: length 15.5 mm., width 19.5 mm. (Rathbun). 
Large male: length 25.4 mm., width 33.4 mm. (Weymouth). 
Type Locality——Monterey Bay, California. 
Distribution.—Pillar Point reef, Half Moon Bay, California, to San Geronimo 
Island, Lower California. 
Remarks.—With regard to the relations of this species I have quoted the 
following from Miss Rathbun’s Harriman Alaska Report (1904a, p. 177): 
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 antennae are less than twice as 
wide as front, the merus of the maxillipeds is no broader than long, the carinae 
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. gibbosulus 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 antennal 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 alternately large 
and small, the first six having blunt angles; the inner supraorbital tooth is well 
developed. 
