THE SPIDER CBABS OF AMERICA 305 



from orbit. Two superior orbital spines. Basal antennal segment 

 short and narrow; flagellum short, concealed beneath rostrum. 

 Outer maxillipeds with the ischium advanced at the antero-internal 

 angle; merus rhomboidal, advanced at middle, outer angle laterally 

 produced, antero-internal margin oblique, ending posteriorly in a 

 slight tooth. Chelipeds elongate, stouter than ambulatory legs. Legs 

 of first pair long, of remaining pairs very short. Abdomen of both 

 sexes composed of seven separate segments. 



Contains only one species, the other species referred to diorinus 

 having been transferred to different genera. 



Restricted to the eastern coast of America and to the Bermudas. 



CHORINUS HERDS (Herbst) 



Plate 107; plate 246, figs. 3-5 



Cancer heros Herbst, Natur. Krabben u. Krebse, 1790, vol. 1, pi. 18, fig. 



102; 1796, vol. 2, p. 165, pi. 42, fig. 1 (tj'pe-locality, ''der Ocean"; type in 



Berlin Mas.). 

 Maja heros Bosc, Hist. Nat. Crust., vol. 1, 1801-2 (an X), p. 251. 

 Maja Mros Latreille, Hist. Nat. Crust., vol. 6, 1803, p. 101. 

 Cancer (Inachus) heros Latreille in Cuvier, Regne Anim., vol. 3, 1817, 



p. 21. 

 Pisa heros Latreille, Encyc. Meth., Hist. Nat., Entom., vol. 10, 1825, p. 



139; in Cuvier, Regne Anim., ed. 2, vol. 4, 1829, p. 58. 

 Chorinus heros Milne Edwards, Hist. Nat. Crust., vol. 1, 1834, p. 315; in 



Cuvier, Regne Anim., Disciples' ed., p. 85, pi. 29, figs. 2-26. — A. Milne 



Edwards, Crust. Reg. Mex., 1875, p. 86. 

 Chorinus barbirostris (Leach MS.) White, List Crust. Brit. Mus., 1847, p. 6. 



Diagnosis. — Carapace oval, with two long horns, connected by a 

 sievelike channel of long hairs. Chelipeds of male very long and 

 stout. Legs of first pair long, of second, third, and fourth pairs short. 



DescrijAion.- — Carapace pubescent, convex, posterior two-thirds 

 smooth, anterior third defiexed, covered with short, blunt tubercles 

 or spines, from which proceed a tuft of coarse hairs; these tubercles 

 are continued part way on the rostrum. Rostral horns stout, usually 

 more or less incurved, about one-third the length of remainder of cara- 

 pace, and furnished on inner edges with two rows of long, closely 

 placed hairs, which rows separating form with those on the opposite 

 horn a long channel. Preorbital spines about one-third length of 

 rostral horns, curved and directed forward. Marginal spines two, 

 one gastric and one hepatic, the former the longer, flattened, both 

 curved. Above the orbit are two tubercles or stout spines, the 

 anterior the larger and more or less compound. The branchial 

 region has a few tubercles at anterior angle and on antero-lateral 

 margin. 



Subhepatic and pterygostomian regions tuberculate. Basal anten- 

 nal segment with a stout spine at its extremity and a tubercle on 

 lateral margin ; almost in the same line there is a tubercle just behind 



