REPORT ON THE BRACHYURA. 
69 
the length of the carapace, and strongly deflexed ; the gastric region is very distinctly 
tuberculated, and there is a distinct spine at the antero-external angle of the basal 
antennal joint. 
$ . Lines. Millims. 
Length of carapace and rostrum, nearly . . . . 9J 19 - 5 
Breadth of carapace, . . . . . . 5 J 1 1 ‘5 
Micippa, Leach. 
Micippa, Leach, Zool. Miscell., yoI. iii. p. 15, 1817. 
„ Milne Edwards, Hist. Nat. Crust., vol. i. p. 329, 1834. 
„ Miers, Journ. Linn. Soc. Lond., tom. cit., p. 661, 1879 ; Ann. and Mag. Nat. Hist., 
ser. 5, vol. xv. p. 3, 1885. 
Carapace nearly oblong, depressed, and rounded behind, with the dorsal surface 
spinose, granulated or tuberculated, and often with lateral marginal spinules or spines. 
Interorbital space broad ; the orbits deep, with two fissures or notches in the superior 
and (usually) in the inferior margins, which are sometimes very incomplete. Rostrum 
broad, lamellate, and vertically or nearly vertically deflexed, more or less distinctly 
bilobated, and sometimes armed with lateral marginal spines. Eyes (in the- species I 
have examined) moderately elongated and capable of being retracted within the orbital 
cavity. Antennae with the basal joints usually very much enlarged, and sometimes 
armed with one or two small distal spines or tubercles ; it occupies the space between the 
base of the rostrum and the orbit, and generally constitutes a part of the inferior wall of 
the orbit ; the following joint is usually compressed and sometimes slightly dilated, and 
is not concealed by the rostrum. The merus of the exterior maxillipedes is distally 
truncated, with the antero-external angle more or less rounded, and the antero- internal 
angle emarginate. The chelipedes (in the male) are moderately developed or short; palm 
somewhat compressed or subcylindrical ; fingers acute, meeting along the inner margins, 
or with a large intermarginal hiatus when closed. Ambulatory legs moderately elon- 
gated, with the joints subcylindrical, and the dactyli nearly straight, little shorter than 
the penultimate joints. 
The species, so far as is known at present, are restricted to the shallower waters of 
the Indo-Pacific or Oriental region. 
The following are the species referable to this genus : — 
1 . Rostrum with eight marginal spines : — - 
Micippa cristata (Linn.). Inclo-Malaysian subregion. 
2. Rostrum terminating in four spines : — 
Micippa mascarenica, Kossmann. Oriental region. 
Micippa philyra (Herbst). Oriental region. 
