182 BULLETIN 152, UNITED STATES NATIONAL MUSEUM 



(Jolor. — Ground white or yellowish, covered with small, irregular, 

 purplish or crimson spots formed by minute rings; color darkest on 

 the nodules. Lower half of chelipeds white. Legs sparingly purplish 

 above, darker at distal end of the merus. Some specimens have a 

 great deal of j^ellow in the ground color, especially on the legs. 



Aleasurements. — Male (14822), length of carapace 87.2, width of 

 same 135.5, fronto-obrital width 32, width of front between antennae 

 12 mm. 



Range. — Labrador to South Carolina. Under stones, low water, 

 to 314 fathoms. 



Material examined. — See table, pages 183-192. 



Figure 30.— Cancer borealis, male, Casco Bay, dorsal view, reduced. After S. I. 



Smith 



CANCER BOREAUS Stimpson 



JONAH CRAB 



Cancer irroraius Sat (part, 9), Journ. Acad. Nat. Sci., Philadelphia, vol. 1, 1817, 

 p. 60. — Gould, Rept. Invert. Massachusetts, ed. 1, 1841, p. 322. 



Plaiycarcinus irroratus Gibbes, Proc. Amer. Assoc. Adv. Sci., vol. 3, 1850, p. 176 

 [12]. 



Cancer borealis Stimpson, Ann. Lye. Nat. Hist. New York, vol. 7, 1859, p. 50 

 (locality. Nova Scotia to Cape Cod; types not extant). — R. Rathbun, 

 Fisheries and Fishery Industries of U. S., sec. 1, 1884, p. 769, pi. 260-, figs. 

 4-6.— Sumner, Bull. Bur. Fisheries, vol. 31, 1911, pt. 2, 1913, p. 672.— Hay 

 and Shore, Bull. Bur. Fisheries, vol. 35, 1915-16 (1918), p. 434, pi. 35, 

 fig. 2, and synonymy. 



Diagnosis. — Teeth of lateral margins with denticulate edges. Car- 

 apace very rough wdth irregular granules. 



