228 University of California Publications in Zoology [Vol. 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 (Eathbun). 



Color. — Brownish red (Eathbun). 



Type Locality. — Long Beach, California. 



Distribution. — Long Beach, California, to Playa Maria Bay, Lower California. 



Cancer jordani Eathbun 



Plate 36, figures 5 and 6 



Cancer jordani Eathbun, Amer. Nat., 34, 133, 1900; H. A. E., 10, 176, 

 pi. 6, fig. 4, 1904; Weymouth, Stanford Univ. Publ., Univ. Ser., no. 4, 

 45, pi. 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. (Eathbun). 

 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. 



Bemarks. — With regard to the relations of this species I have quoted the 

 following from Miss Eathbun 's Harriman Alaska Eeport (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. antlwnyi the anterolateral teeth are low and broad, not alternately large 

 and small, the first six having blunt angles; the inner supraorbital tooth is well 

 developed. 



