REPOET ON THE BRACHYURA. 
267 
the anterior margin abruptly four-lobecl above the front, which is broad and vertically 
deflexed. Orbits rather large, with two hiatuses below, and with the interior subocular 
lobe well-developed. Epistoma very short, transverse. The ridges of the endostome 
distinctly developed. Post-abdomen (in the male) rather broadly triangulate, distinctly 
seven-jointed, and occupying the whole width of the sternum at the base between the 
coxse of the fifth ambulatory legs. Eye-peduncles short, robust. Antennules trans- 
versely plicated in the narrow, wide fossettes. Antennae with the basal joint broad and 
very short; they are completely excluded from the orbit by the intervening subocular 
orbital lobe. Exterior maxillipedes narrow, widely gaping and remote from one another at 
the base (as in Grapsus ) ; the merus of the endognath nearly as long as the ischium, 
widening to the distal extremity, which is truncated ; the next joint articulated near the 
antero-external angle of the merus ; exognath very slender. Chelipedes (in the adult 
male) robust ; merus trigonous, with the anterior margin dentatecl ; carpus and hand 
strongly granulated ; palm somewhat compressed ; fingers but slightly excavated or 
subacute. Ambulatory legs robust, with the merus-joints broadly dilated and com- 
pressed; penultimate joints spinuliferous and dactyli armed with strong spines. 
The genus is somewhat intermediate between Grapsus, from which it is distinguished 
by the great development of the interior subocular lobe and form of the carapace, and 
Sesarma. 
There are but two species : — Goniopsis cruentatus, whose synonyma and wide distribu- 
tion are referred to by Kingsley and S. J. Smith, and Goniopsis pulcher (Lockington), 
which is apparently distinguished by the coloration, and occurs on the coasts of Lower 
California and Panama (Coll. Brit. Mus.). 
Goniopsis cruentatus (Latreille). 
Grapsus cruentatus, Latreille, Hist. Nat. Crust, et Ins., vol. vi. p. 70, 1803-1804. 
,, „ Milne Edwards, Hist. Nat. Crust., vol. ii. p. 85, 1837. 
Gonicrpsis cruentatus, de Idaan, Crust, in v. Siebold, Eauna Japonica, p. 33, 1835. 
,, „ Milne Edwards, Ann. d. Sci. Nat., tom. cit., p. 164, pi. vii. figs. 2, 2a, b, 
1853. 
„ ,, Kingsley, tom. cit., p. 190, 1880, et synonyma. 
Goniograpsus cruentatus, Dana, U.S. Explor. Exped., vol. xiii., Crust., p. 342, pi. xxi. fig. 7, 
1852. 
Bermuda (a large series of specimens, males and females); some of these are labelled 
as from Hungry Bay, in the mangrove swamps. 
Adult $. 
Lines. 
Millims. 
Length of carapace, . 
18 
40-5 
Breadth of carapace, . 
22\ 
47-5 
