REPORT ON THE BRACHYURA. 
299 
Arcania, Leach. 
Arcania, Leach, Zool. Miscell., vol. iii. p. 19, 1817. 
„ Milne Edwards, Hist. Nat. Crust., vol. ii. p. 133, 1837. 
,, Dana, U.S. Explor. Exped., vol. xiii., Crust. 1, p. 392, 1852. 
,, Bell, Trans. Linn. Soc. Lond. (Zool.), vol. xxi. p. 309, 1855. 
Iphis, Leach, Zool. Miscell., vol. iii. p. 19, 1817. 
,, Milne Edwards, Hist. Nat. Crust., vol. ii. p. 138, 1837. 
„ Dana, tom, cit., p. 392, 1852. 
„ Bell, tom. cit., p. 311, 1855. 
Carapace convex, subglobose, or somewhat rhomboidal, with the dorsal surface 
tuberculated, granulated or spinuliferous ; the lateral and posterior margins nearly 
always armed with spines. Front usually rather prominent and bilobed. Orbits 
(as usual) with three marginal fissures and a rather wide interior hiatus ; the interior 
subocular angle usually spiniform. The post-abdomen in the male is narrow, with two 
or three of the intermediate segments coalescent. Eyes small. Anten nules obliquely 
plicated. Antennae with a slender basal joint, which does not fill the interior orbital 
hiatus ; flagellum moderately developed. The merus of the endognath of the exterior 
maxillipedes is usually much shorter than the ischium, and is often only subacute at the 
distal extremity ; the exterior margin of the exognath is straight. The chelipedes (in 
the adult males) are slender and somewhat elongated, and, as usual in this subfamily, 
the merus is subcylindrical, and the palm slender and somewhat swollen at the base ; the 
fingers open in a vertical plane and are armed with minute teeth, some of which are 
spinuliform. Ambulatory legs slender and somewhat elongated, with the clactyli 
styliform. 
The species occur throughout the Indo-Pacific region in shallow or moderately deep 
water. 
To the species enumerated by Bell are to be added : — 
Arcania globata, Stimpson. Seas of China and Japan (16 to 25 fathoms). 
Arcania orientalis, Miers. Japan, 30 to 36 fathoms. (This species is inter- 
mediate between this genus and Ebalia.) 
Arcania novem-spinosci, Adams and White, var. aspera, Miers. Malaysian 
Seas. 1 
1 1 have proposed the name Arcania duodecimspinosa for a specimen from the Seychelles (4 to 12 fathoms), of 
whose specific distinctness I am somewhat uncertain, on account of its very small size. Arcania granulosa, Miers, 
from Moreton Bay, is, as I have elsewhere noted, probably identical with Arcania undecimspinosa, de Haan, and 
Arcania pulcherrima, Haswell, with Arcania septemspinosa, Bell, but as the latter name is preoccupied by Fabricius 
and Leach for Arcania (Iphis) septemspinosus, Haswell’s name may be conveniently used to designate Bell’s species. 
