REPORT ON THE BRACHYURA. 
19 
rather more than twice as long as the carapace ; merus and carpus covered with unequal 
spinules, the merus with a stronger spine near its distal extremity ; palm longer than the 
carpus, turgid, granulated or spinuliferous on the outer surface and on the upper margin 
near the base ; dactyli nearly as long as the palm, smooth, nearly straight, with acute 
apices and dentated on the inner margins near the base. Ambulatory legs slender, of 
moderate length, with a small spine or tubercle at the distal extremity of the merus- 
joints ; the dactyli of the fourth and fifth legs distinctly falcated. The body and limbs 
are pubescent. Colour light yellowish-brown. 
A male, 1 preserved in spirit, in the Challenger collection presents the following 
dimensions : — 
Adult (? . 
Lines. 
Millims. 
Length of carapace and rostrum, nearly 
* 
5 
10 
Breadth of carapace, . . . . 
4 
8-5 
Length of a chelipede, about . 
9 
19-5 
Length of first ambulatory leg, 
* 
11 
23 
Inachus, Fabricius. 
Inachus, Fabricius ( partim ), Entom. Syst. Suppl., p. 355, 1798. 
„ Milne Edwards, Hist. Nat. Crust., vol. i. p. 286, 1834. 
„ Miers, Jouru. Linn. Soc. Lond. (Zool.), vol. xiv. p. 645, 1879. 
Carapace triangulate, with the regions well defined. Rostrum very short, bilobated; 
no prseocular spine, postocular spine large. Post-abdomen composed of six distinct 
segments. Eyes moderately developed. Basal antennal joint slender, and reaching the 
front. Outer maxillipedes with the merus-joint somewhat elongated and rounded at the 
distal extremity. Chelipedes with the palm more or less inflated. Ambulatory legs 
elongated, with the dactyli nearly straight. 
The well-established species of this genus are apparently restricted to the European 
Seas and Western North Atlantic, and occur commonly in water of moderate depth. 
M. A. Milne Edwards mentions that several species were taken in the Mediterranean 
during the recent expedition of the “ Travailleur ” at 445 to 455 metres. 
The following species have been described: — (1) Inachus dorsettensis (Pennant) 
= Cancer scorpio, Fabricius, Inachus mauritanicus, Lucas, and var. latus, Brandt ; (2) 
Inachus dorhynchus, Leach; (3) Inachus leptochirus, Leach = Inachus leptorhynchus, 
Desmarest ; (4) Inachus thoracicus, Roux ; (5) Inachus aguiarii, B. Capello. 2 
1 The figure, drawn when the author was much engaged on other work, is inadvertently taken from the adult 
female, which differs from the male in the rather broader carapace and less turgid chelipedes. 
2 The Australian species described by Gray as Inachus australis, perhaps belongs to the genus Chlorinoides. 
Kuppell’s Inachus arabicus from the Bed Sea is Menxthium monoceros. Inachus tuberculatus, Lockington, from 
California, does not belong to this genus, as the rostrum is entire. 
