268 
THE VOYAGE OF H.M.S. CHALLENGER. 
Helice, de Haan. 
Helice, de Haan (subgenus), Crust, in v. Siebold, Fauna Japonica, decas ii. p. 28, 1835. 
„ Milne Edwards, Ann. d. Sci. Nat., ser. 3, Zool., vol. xx. p. 189, 1853. 
„ Kingsley, Proc. Acad. Nat. Sci. PLilad., p. 219, 1880. 
Carapace dorsally thick and convex, transverse, quadrate, with the antero-lateral 
margins straight and dentated. Front of moderate width and curving downwards, but 
not abruptly deflexecl ; the anterior margin not projecting as in the genus or subgenus 
Paragrapsus. The orbits are large. The epistoma is transverse and very short. The 
endostomian ridges are distinctly defined. The post-abdomen in the male is distinctly 
seven -join ted, and at the base does not quite cover the whole wficlth of the sternum between 
the bases of the fifth ambulatory legs. The eye-peduncles • are rather short, and do not 
reach the antero- external angle of the orbit. The antennules are transversely plicated. 
The basal antennal joint is very small, and does not reach the extero-lateral angle of 
the front, and it lies within the interior hiatus of the orbit. The exterior maxillipedes 
have between them, when closed, a rhomboidal gape ; the merus of the endognatli is 
externally concave, as long or nearly as long as the ischium, and widens to the distal 
extremity, which is truncated or slightly concave ; the following joint is articulated at or 
near the antero-external angle of the merus ; the exognath is very narrow. The chelipedes 
(in the adult male) are subequal and moderately developed ; merus trigonous ; carpus 
angulated, but usually without a spine at the interior angle ; palm rounded or subcarinated 
above, fingers subexcavated at the distal extremity. Ambulatory legs rather slender, with 
the merus-joints not markedly dilated ; the dactyli slender, styliform, and unarmed. 
This genus is very nearly allied to Chasmagnathus, de Haan, of which it should, 
perhaps, be considered a subgenus. It is scarcely distinguished from it by any constant 
character, except the nearly straight, not arcuated, antero-lateral margins of the carapace 
in the male. From Paragrapsus, Milne Edwards, which Mr. Kingsley unites with 
Chasmagnathus , it is further distinguished by the thicker body and the non-projecting 
anterior margin of the front. 
Besides the species enumerated by Kingsley, the following should perhaps be referred 
to Helice : — 
Helice (?) longipes ( Sesarma longipes, Krauss). South Africa, Umlaas (? Umlazi) 
River. 
Helice latreillei, Milne Edwards, var. (PI. XXI. fig. 2). 
Cyclograpsus latreillei, Milne Edwards, Hist. Nat. Crust., vol. ii. p. 80, 1837. 
Helice latreillei, Milne Edwards, Ann. d. Sci. Nat., tom. cit., p. 190, 1852. 
„ „ Kingsley, tom. cit., p. 220, 1880. 
Philippine Islands, Samboangan, 10 fathoms, on the reefs (a small male); Fiji Islands. 
Kandavu (an adult female). 
