REPORT ON THE BRACHYURA. 
131 
tooth or spine at the outer angle of the orbit, although smaller than the second antero- 
lateral tooth. 
Adult cJ . 
Lines. 
Millims. 
Length of carapace, nearly 
3 
6 
Breadth of carapace, about 
4 
8-5 
Length of a chelipede, nearly . 
5 
10 
Length of second ambulatory leg, 
5-i- 
12 
Etisus , Milne Edwards. 
Etisus, Millie Edwards (pt.), Hist. Nat. Crust., vol. i. p. 410, 1834. 
„ Dana, U.S. Explor. Exped., vol. xiii., Crust. 1, pp. 149, 183, 1852. 
In this genus, -which, as Dana has shown, represents in the subfamily or section 
Chlorodiinse the genus Cancer in the Cancrime, the carapace is usually moderately 
convex, widely transverse, more or less distinctly lobulated or uneven on the dorsal 
surface, with the antero-lateral margins divided into from five to eight lobes, teeth or 
spines, between which are sometimes some smaller teeth or spines. The frontal lobes are 
truncated, with a median notch or closed fissure, and are separated by a wider hiatus 
from the interior angle of the orbit, which is usually prominent or rounded. The orbital 
margins have two or three marginal notches or fissures, and their inner subocular angles 
are dentiform or acute. The post-abdomen in the male is usually five or six-jointed, 
with two or three of the intermediate segments coalescent and forming a single joint. 
The antennules are obliquely or transversely plicated. The basal joint of the antennae 
is enlarged, and is considerably produced at its extero-distal angle, so as to completely 
exclude the flagellum from the orbit. The ischium of the exterior maxillipedes is not 
produced at its antero-internal angle, the merus is scarcely, if at all, emarginate at its 
antero -internal angle. The chelipedes in the adult males are usually unequal and 
considerably developed, with the merus somewhat elongated, carpus with a strong spine 
or tooth on its inner margin, palm not carinated, fingers toothed or tuberculated on the 
inner margins and meeting only at the apices, which are strongly excavated. The 
ambulatory legs are of moderate length, with the joints sometimes compressed but not 
carinated, and often armed with spines or spinules. 
The species, which often attain a considerable size, occur on the shores and islands of 
the Indo-Pacific region . 1 
The following are species referable to the genus Etisus as at present restricted : — 
Etisus Isevimanus, Randall, common throughout the Indo-Pacific Region, from the 
Red Sea and Mozambique to the Polynesian Islands : Etisus utilis, Jacquinot and Lucas, 
which occurs from Singapore eastward to New Caledonia, and at Cochin-China and the 
1 The West-Indian Etisus occidentalis of White (List Crust. Brit. Mus., p. 20, 1847), is not properly referable to 
tliis genus, but is synonymous with Leptodius floridanus, Gibbes. 
