THE CANCROID CRABS OF AMERICA 215 



Catalina Harbor, Santa Catalina Island, Calif.; 30-40 fathoms; 

 sandy mud; W. H. Dall; 1 male, 1 young (14660). 



CANCER JORDANI Rathbun 



Plate 94, Figures 1 and 2 



Cancer jordani Rathbun, Amer. Nat., vol. 34, 1900, p. 133 (type-locality, Monterey 

 Bay; type. Cat. No. 22868, U.S.N.M.); Harriman Alaska Exped., vol. 10, 

 1904, p. 176, pi. 6, fig. 4.— Weymouth, Stanford Univ. Publ., Univ. Ser. No. 

 4, 1910, p. 45, pi. 10, fig. 30.— ScHMiTT, Univ. Calif. Publ. Zool., vol. 23, 1921, 

 p. 228, pi. 36, figs. 5, 6. 



Diagnosis. — Carapace hairy; antero-lateral teeth spiniform, curved, 

 alternating in size; one postero-lateral tooth. 



Description. — Carapace slightly areolated, hairy, and covered with 

 small crowded scabrous granules; antero-lateral teeth separated to 

 their bases, curved forward, tips spiniform, very slender; second, 

 fourth, sixth, and eighth teeth smaller than the others; 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; one postero-lateral tooth is indicated in older specimens and 

 less conspicuously so in younger ones by a slight gap in the spinules 

 marking that margin. Fronto-orbital width nearly half width of 

 carapace. Inner orbital tooth very slightly produced; margin of 

 upper intermediate orbital lobe almost transverse, scarcely dentiform. 

 Tooth of basal antennal article and the adjoining tooth of the orbital 

 margin acute. Movable part of antennae half as long as carapace. 

 Merus of outer maxilliped obliquely truncated, margin' at a slightly 

 obtuse angle to outer margin, corner rounded; the merus consider- 

 ably overlaps the epistome and the basal article of the antenna. 

 Seven carinae on upper-outer surface of palm are fringed with hair, 

 the two superior carinae with several spines. Upper surface of basal 

 half of movable finger rough wdth sharp granules. Tips of fingers 

 light; the dark color runs along the prehensile margins to the base or 

 nearly so, but about % or Ys of the outer margin. Legs hairy. 



Color. — A male from Laguna Beach preserved in formalin showed a 

 regular pattern on the carapace in brick-red blotches. The largest 

 patch stretches from the anterior half of the postero-lateral margin 

 obliquely toward the gastric region; two short patches stretch 

 obliquely outward and forward from the posterior margin. A patch 

 of the same color occupies nearly all of the lower surface of the arm, 

 while a darker shade covers the dorsal aspect of the cheliped. 



Measurements. — Male (50299), length of carapace 21, width of 

 same 27.4, fronto-orbital width 11.9, width of front between antennae 

 4, width between tips of inner orbital teeth 6.6 mm. 



Range. — From Humboldt Bay, Calif., to San Geronimo Island, 

 Lower California, Mexico. 



Material examined. — See table, pages 216-217. 



