DECAPODS 177 



siderably the basal joint of the antennae ; merus longer than wide. The 

 palms of the chelipeds have 2 superior and 5 external carinae 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 9 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 

 antennae are less than twice as wide as front, the merus of the maxilli- 

 peds 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 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. 



