142 BULLETIN 152, UNITED STATES NATIONAL MUSEUM 



three small spines on outer face. Hand crossed by granulous carinae 

 inside and out and armed above with four spines alternately placed, 

 two on inner border and two on outer border of upper surface. A 

 strong spine followed by a deep sinus and a small spine at postero- 

 distal end of merus of swimming foot. 



Color. — Violet red or deep purple red more or less marbled with a 

 lighter shade or white. Extremity of all spines black. 



Young. — The front is less advanced, the median pair of teeth sub- 

 truncate. In specimens 7 mm. wide the front is arcuate, cut into 

 shallow lobes, the four small antero-lateral teeth are scarcely dis- 

 tinguishable. 



Measurements. — Male (48801), total length of carapace 50.2, width 

 of same 75, fronto-orbital width 40.4, interorbital width 26.5, width 

 of front 13.7 mm. 



Range. — Charleston Harbor, South Carolina, to the State of Santa 

 Catharina, Brazil. Lower California, Mexico, to Peru and the Gala- 

 pagos Islands. West Africa from Cape Verde Islands to Loanda. 



Material examined. — See table, pages 140-141. 



CRONIUS TUMIDULUS (Stimpson) 



Plate 64 

 Achelous lumidulus Stimpson, Bull. Mus. Comp. Zool., vol. 2, 1871, p. 149 



(type-localities, West of Tortugas, 37 fathoms, and off Conch Reef, 40 



fathoms; types not extant). 

 Neptunus tumidulus A. Milne Edwards, Crust. R6g. Mex., 1879, p. 218. 

 Cronius bispinosns Miers, Challenger Rept., Zool., vol. 17, 1886, p. 188, pi. 



15, fig. 2-2& (type-locality, Bahia; type in British Museum). 

 Charybdella tumidula Rathbun, Bull. U. S. Fish Comm. for 1900, vol. 2, 1901, 



p. 51. — Verrill, Trans. Connecticut Acad. Arts and Sci., vol. 13, 1908, 



p. 393, pi. 19, fig. 1. 

 Cronius lumidulus Rathbun, in Boeke, Rapport Vischerij Kolonie Curasao, 



part 2, 1920, p. 18. 



Diagnosis. — Two gastric, three branchial and one cardiac ridge. 

 Upper inner orbital angle feebly bidentate. Spines not black tipped. 

 Two spines on wrist, two on hand. A row of spinules but no spine 

 on lower half of distal end of merus of swimming foot. 



Description. — Carapace narrower than in C. ruber, pubescent, 

 granulated toward margins. Two short granulate carinae behind 

 the long branchial carina, also a transverse carina on the cardiac 

 region. Last spine of antero-lateral border half again as long as 

 seventh spine. The small alternate spines are unequal, diminishing 

 in the following order: Second, fourth, sixth, eighth. Front con- 

 vex, prominent, projecting much beyond level of outer angles of 

 orbits; teeth rounded, the two middle ones being smaller than the 

 second pair and most prominent, separated from second pair by a 

 rather broad, shallow sinus; a narrow sinus between second pair 

 and the antennal tooth or inner angle of orbit; this angle is very 



