THE CANCROID CRABS OF AMERICA 



181 



Industries of U. S., sec. 1, 1884, p. 766, pi. 260, figs. 1-3.— Sumner, Bull. 



Bur. Fisheries, vol. 31, 1911, part 2, 1913, p. 671.— Hay and Shore, Bull. 



Bur. Fisheries, vol. 35, 1915-16 (1918), p. 435, pi. 35, fig. 1. 

 Platycarciniis irroratus Milne Edwards, Hist. Nat. Crust., vol. 1, 1834, p. 414. — 



DeKay, Nat. Hist. New York, pt. 6, Crust., 1844, pi. 2, fig. 2. 

 Cancer sayi Gould, Rept. Invert. Massachusetts, ed. 1, 1841, p. 323 (type- 

 localities. Cape Ann, Nahant, etc.; types not located). 

 Plaiycarcinus sayi DeKay, Nat. Hist. New York, pt. 6, Crust., 1844, p. 7. 

 Cancer borealis Packard, Mem. Boston Soc. Nat. Hist., vol. 1, 1867, pi 303; 



not C. borealis Stimpson. 

 Cancer amoenus Connolly, Contrib. Canad. Biol., n. s., vol. 1, 1923, p. 337, 



text-figs. 1 and 2, pis. 1-4. Not Cancer amoenus Herbst, 1799. 



Diagnosis. — Nine antero-lateral and two postero-lateral teeth, the 

 last one obscure; edges entire. Chehpeds granulate, not denticulate. 



^^^. 



Figure 29.— Cancer irroratus, male, dorsal view, reduced. After R. Rathbun 



Description. — Carapace convex, uneven, finely granulate. Antero- 

 lateral teeth 9, the first one broad and in part produced to form the 

 orbital tooth; teeth shallow, edge granulate, the notches between 

 them continued on the carapace as short, closed fissures giving a 

 pentagonal aspect to the teeth. Postero-lateral margin a raised 

 granulate carina furnished with two teeth, the one nearest the lateral 

 angle small, the other obscure. The median tooth of the front is 

 the most advanced and depressed. 



Chelipeds shorter than first pair of legs, granulate; upper margin 

 of merus ending in a short, subdistal tooth; carpus with granulated 

 ridges and a sharp pyramidal inner tooth; manus with 6 longitudinal 

 costae, the two lower ones continued on the finger, the upper one 

 cristate. Legs rather long, compressed; merus of first and second 

 pairs extending well beyond carapace. Side margins of 5th-6th 

 abdominal segment in male converging distally. 



