THE GRAPSOID CKABS OP AMERICA. 329 



Ocean (M. Edw.). Hongkong (Stimpson). By many authors, this 

 species is united with G. audouinii Milne Edwards 1 which inhabits 

 New Guinea, Australia, New Zealand, etc., but the latter is more 

 convex in both directions, the front is narrower and not visible in a 

 dorsal view, the crest on the inner face of the hand is granulated, the 

 prehensile edge of the thumb bears a prominent lobe, the male 

 abdomen is much more triangular. 



Material examined. 



Valparaiso Bay, Chile; C. E. Porter; 1 male, 1 female (Valparaiso 

 Mus.). 



Cape Town, South Africa; Aug. 12, 1877; I. Russell; 2 males. 

 (3240). 



Genus CHASMAGNATHUS de Haan. 



Chasmagnathus DE HAAN, Fauna Japon., 1833, p. 5; 1835, p. 27; type, r. 

 convcxus de Haan. 



Carapace transverse, sides more or less arcuate, dentate, postero- 

 lateral regions inclined, front rounding down to the epistome. Front 

 arcuate, its posterior width from one-half to one-third the width of 

 the carapace. Orbits very open, a sulcus continued backward to 

 their outer angle. Antennulcs obliquely folded, antennae standing 

 in the orbital hiatus. Epistome deep, prominent beyond the front, 

 bearing a transverse crest in line with the infero-orbital crest. Reti- 

 culation of the side walls fairly regular, the granules bead-like and 

 arranged singly in rows, the hairs plumed at base. Merus of outer 

 maxilliped larger than ischium, subtriangular, the palpus articu- 

 lating on the broad anterior margin between the middle and the 

 outer angle. 



Chelipeds strong in the male ; fingers pointed, tips hollowed. Legs 

 of moderate length, second pair longest; dactyli styliform. 



Abdomen with all segments separate, in the male not covering all 

 the sternum between the last pair of legs. 



Distribution. Atlantic coast of South America, from Rio Janeiro 

 southward. From Japan to Australia. 



CHASMAGNATHUS GRANULATA Dana. 



Plate 100; plate 159, fig. 9. 



Chasmagnathus granulatus DANA, Proc. Acad. Nat. Sci. Philadelphia, vol. 

 5, 1S51 (1S52), p. 251 (type-locality, paludc juxta lacum " Pctcninga " 

 ttr&i "72/o Janeiro " riclnum; type not extant) ; U. S. Expl. Exped., vol. 

 13, Crust., pt. 1, 1852, p. 3G4; atlas, 1S55, pi. 23, fig. Go-d. 



Diagnosis. Carapace naked above. Palms granulate. 

 Description. Carapace subquadrate, narrowest at the anterioi 

 angles, side margins slightly sinuous; convex in both directions, the 



Hist. Nat. Crust., vol. 2, 1837, p. 78. 



