426 BULLETIN 129^ UNITED STATES NATIONAL MUSEUM 



Aruba, Curasao; 1905; J. Boeke: Paarden Bay; 1 fathom; coral 

 rocks; March 8; 1 male, 1 young (Leiden Mus.). Lagoon; shallow 

 water; among algae; August 8; 1 young (42974). 



Caracas Bay, Curasao; 1920; C. J. van der Horst; 3 males, 1 

 female (Amsterdam Mus.)- 



Spanish Port, Curasao; April 10, 1920; C. J. van der Horst; 1 

 male (56866). 



Brazil; off the Abrolhos Islands; 30 fathoms; 1872; U. S. C. S. S. 

 Hassler; 1 young female (1990, M. C. Z.) ; " M. coronatus" (A. Milne 

 Edwards) . 



MITHRAX (MITHRACULUS) CORYPHE (Herbst) 



Plate 153 



Cancer coronatus Herbst, Natur. d. Krabben u. Krebse, vol. 1, 1785, p. 184, 



pi. 11, fig. 63 (type-locality not given; type not extant). Not Seba, 



Thesaurus, vol. 3, 1758, pi. 22, fig. 6; nor Cancer coronatus Molina, 1782. 

 Cancer coryphe Herbst, Natur. d. Krabben u. Krebse, vol. 3, pt. 2, 1801, 



p. 8 (type-locality not given; type not extant). 

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



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

 Miihrax sculptus Desbonne and Schramm, Crust. Guadeloupe, 1867, p. 9. 



Not M. sculptus Lamarck. 

 Mithrax {Mithraculus) coronatus Miers, Journ. Linn. Soc. London, vol. 14, 



1879, p. 667. 

 Mithrax coronatus Miers, Challenger Rept., ZooL, vol. 17, 1886, pp. 87 



and 89. 

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



Diagnosis. — Carapace a third wider than long, everywhere nodose. 

 Three antero-lateral lobes. Wrist nodose. 



Description. — Carapace very wide, about one-third wider than 

 long. Rostrum small, with 2 truncate teeth separated by a V-sinus. 

 Behind the horns 2 sharp granules. Gastric and cardiac regions 

 roughened by a few, regularly placed nodules. Branchial regions 

 crossed obliquely by 3 deep furrows, forming 3 oblique elevations; 

 the two anterior are entire or nearly so, the posterior broken into 2 

 rounded nodules. Antero-lateral margins armed with 3 smooth, 

 round, widely-spaced lobes. A small lobe on postero-lateral margin. 

 The inner infra-orbital lobe is more advanced than the supra-orbital. 

 Basal antennal joint subtriangular, a small, marginal lobe just 

 outside base of antenna. 



Chelipeds massive; arm bilobed on inner margin, 4- or 5-lobed on 

 outer margin, a few tubercles on upper surface and one at distal end 

 of lower surface; wrist obscurely nodose; palm broad; fingers 

 deflexed, widely gaping in the old, a single tooth near base of dactyl, 

 edges of spooned tips crenulate. Legs more or less rough and fringed 

 with coarse setae; merus joints of first two legs armed with two 

 teeth below; carpus joints of first three legs spinous above. 



