THE GRAPSOID CKABS OF AMERICA. 329 



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

 species is united with O. audouinii Milne Edwards^ 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. 



Chasmagnathvs de Haan, Fauua Japon., 1833, p. 5; 1835. p. 27; type. ('. 

 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 phmied at base. Meriis of outer 

 maxilliped larger than ischium, subtriangular, the palpus articu- 

 lating on the broad ar-terior margin between the middle and tho 

 outer angle. 



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

 of moderate length, second pair longest; dactjdi styliform. 



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

 the sternum between the last pair of legs. 



Distrilnition. — Atlantic coast of South America, from Rio Janeiro^ 

 southward. From Japan to ^\.ustralia. 



CHASMAGNATHUS GRANULATA Dana. 



Plate 100; plate 159, fig. 0. 



Ohasmagnathns granulatus Dana, Proc. Acad. Nat. S(;i. Philadelphia, vol.. 

 5, 1851 (1852), p. 251 (type-locality, jmJude juxta lacum " I'cicuinfja" 

 urhi "Rio Janeiro " r.ictnum; tj'pe »ot extant) ; U. S. Expl. Exped., vol.. 

 13, Crust., pt. 1, 1852, p. 3G4; atlas, 1855, pi. 2.*^, fig. Ga-d. 



Diagnosis. — Carapace naked above. Palms granulate. 

 Description. — Carapace subquadrate, narrowest at the antcrioi 

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



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



