100 Bulletin, Vanderhilt Marine Museum, Vol. II 



the brancliial region. The posterior of these elevations is broken into 

 two nodules ; there are also a few rounded nodules on the gastric and 

 cardiac regions. The side walls of the carapace are rough with small 

 tubercles in the younger specimens. 



The chelipeds are equal, of moderate size in the female, rather mas- 

 sive in the male, the merus with two nodes or teeth on the inner and 

 four or five teeth on the outer margin; the carpus is rounded, the 

 propodus longer than the merus, wide, smooth, the fingers two-thirds 

 as long as the palm, deflexed, widely gaping ; old males with one large, 

 sub-basal tooth; tips spoon-shaped, crenulated, meeting. 



Ambulatories rather long, heavily fringed with algae-like setae, 

 merus of first and second legs armed with two spines on the inferior 

 margin ; carpus of all except the last pair spinulose above. 



Synonymy. — Cancer coronatus Herbst, Natur d. Krabben u. Krebse, 

 vol. 1, p. 184, pi. 11, fig. 63, 1785. 



Cancer coryphe Herbst, ihid., vol. 3, pt. 2, p. 8, 1801. 



Mithraculus coronatus White, List Crust. Brit. Mus., p. 7, part, 1847. 

 —A. Milne Edwards, Crust. Reg. Mex., p. 106, pi. 20, fig. 1, 1875. 



Mithrax sculpt us Desbonne and Schramm, Crust. Guadeloupe, p. 9, 

 1867. 



Mithrax (Mithraculus) coronatus Miers, Journ. Linn. Soc. London, 

 vol. 14, p. 667, 1879. 



Mithrax coronatus Miers, Challenger Kept. Zool., Brachyura, vol. 17, 

 pp. 87 and 89, 1886. 



Mithrax coryphe Rathbun, Ann. Inst, Jamaica, vol. 1, 1897, p. 11. 



Mithrax (Mithraculus) coryphe Rathbun, Bijdragen tot de Dier- 

 kunde, Natura Artis Magistra, Aflev. 23, p. 20, 1924 ; Bull. 129, 

 U. S. Nat. Mus., p. 426, pi. 153, 1925. 



Mithrax (Mithraculus) forceps (A. Milne Edwards). 



Plate 30, fig. B. 



Diagnostic characters : Deep bottle green. Carapace wider than 

 long ; four acute anterolateral teeth ; three oblique sulci running back- 

 ward from between these teeth onto the branchial region; the ridges 

 between these sulci but little broken up. Chelipeds massive in the 

 male ; carpus and propodus smooth. 



