Boone, Crustacea, Cruises of "Eagle" and "Ara," 1921-28 91 



and a series, some of which are acute, some obtuse, place irregularly 

 on the subbranchial and pterygostomanian regions. 



The chelipeds are equal in the females, but are decidedly unequal in 

 the larger males. The merus is armed with five or six strong spines 

 on the outer lateral margin, two or three moderate-sized ones on the 

 upper surface and two to four strong ones on the upper lateral mar- 

 gin ; the carpus is short, smooth, convex on the upper and outer sur- 

 faces; the propodus (female) is about as long as the carapace, smooth, 

 laterally compressed; the fingers comprise scarcely one-third of the 

 total propodal length, and are slender, subequal, the tips rounded and 

 the inner edge set with a series of fine interfitting teeth. 



The ambulatories are similar, successively decreasing posteriorly 

 in length; each has the meral, carpal, and, in a less degree, the pro- 

 podal joints are armed on the upper edges with a longitudinal series 

 of spines ; the propodi and dactyli are covered with a tufting of fine, 

 dense golden setae. The joint of the propodus with the dactyl is rein- 

 forced by a projecting rounded end of the propodus extending down 

 upon the outer side of the dactyl. The tip of the dactyl is sharply 

 curved, horn-color, chitinous. 



Synonymy. — Cancer hispidus Hekbst, Natur. Krabben u. Krebse, vol. 

 1, p. 245, pi. 18, fig. 100, 1790. 



Maia spini-cincta Lamarck, Hist. Nat. Anim. sans Vert, vol. 5, p. 241, 

 1818. 



Maja spini-cincta Say, Journ. Acad. Nat. Sci. Phila., vol. 1, p. 458, 

 1818. 



fMithrax spinicinctus Desmarest, Diet. Sci. Nat., vol. 28, p. 264, 1823 ; 

 Consid. sur les Crust., p. 150, pi. 23, fig. 1, 1825. 



Mithrax hispidus H. Milne Edwards, Mag. de Zool., vol. 2, cl. 7, p. 

 13, 1832 ; Hist. Nat. Crust., vol. 1, p. 322, 1834.— A. Milne Ed- 

 wards, Crust, Reg. Mex., p. 93, pi. 21, figs. 1-lb, 1875. — Miers, 

 Journ. Linn. Soc. London Zool., vol. 14, p. 673, pi. 13, figs. 7 and 

 8, 1879.— Rathbun, Proc. U. S. Nat. Mus., vol. 15, p. 265, 1892 

 (in part). — Verrill, Trans. Conn. Acad. Arts and Sci., vol. 13, 

 p. 404, text fig. 40, pi. 23, figs. 3 and 4, pi. 24, fig. 1, 1908. 



Mithrax hispidus Rathbun, Bull. 129, U. S. Nat. Mus., p. 406, pi. 146, 

 146 and pi. 147, fig. 3, text fig. 124, 1925.— Boone, Bull. Bingham 

 Oceanog. CoU., vol. 1, part 2, p. 38, 1927. 



