1895.] 
A. Alcock —Card nolo gical Fauna of India. 
197 
three tubercles, disposed in a triangle, on the gastric region; (3) by 
the larger and more prominent eyes ; (4) by the absence of the lobule 
on either side of the posterior border of the carapace ; (5) by the much 
more massive chelipeds of the male. 
This species is included in the Indian Fauna on the authority of 
Prof. J. R. Henderson. There are no specimens in the Indian Museum. 
Men^thius, Edw. 
Mensethius , Milne-Edwards, Hist. Nat. Crust. I. 338. 
Mensethius, Miers, Journ. Linn. Soc., Zool., Yol. XIY. 1879, p. 649; and ‘ Challen¬ 
ger ’ Brachyura, p. 36. 
Carapace subpyriform, moderately convex, and tuberculated on 
the dorsal surface, with a large triangulate prse-ocular spine, but no 
post-ocular spine. Rostrum simple, slender, acute, or emarginate at 
apex. Post-abdomen in the male seven-jointed, in the female usually 
five-jointed, the penultimate joint formed by the coalescence of three 
segments. Eyes small, mobile, but not perfectly retractile. Basal 
antennal joint slightly wider at the base than at the distal extremity, 
which is unarmed ; flagellum exposed and visible from above at the 
side of the rostrum. Merus of the exterior,articulated with 
the distal extremity and with a EZNW) well developed, with the palm 
slightly notched at the antedate, and having between them, when 
the next joint. Chelipg base. Ambulatory legs of moderate length ; 
slightly compre^Srical, not dilated or compressed; dactyli slightly 
closed, an int/ally retractile. (Miers). 
the joirH 
cu ^- Mensethius monoceros , (Lr*tr.) Edw. 
[Pisa monoceros , Latr., Encycl. X. 139.] 
Inachus arabicus, Biippell, Krab. Both. Meer., p. 24, pi. v. fig. 4. 
Mensethius monoceros, Milne-Edwards, Hist. Nat. Crust., Yol. I. p. 339. 
Mensethius subserratus, porcellus, and tuberculatus, Adams and White, ‘ Samarang ’ 
Crustacea, pp. 18 and 19, pi. iv. figs. 1 and 2. 
Mensethius angustus, depressus, subserratus, tuberculatus, areolatus and inornatus, 
Dana, U. S. Expl. Exped., Crust. I. pp. 121-125, pi. iv. figs 5a-7g, and pi. v. 
figs. la-3<Z. 
Mensethius subserratus, dentatus and depressus, Stimpson, Proc. Ac. Nat. Sci. 
Philad., 1857, p. 219. 
Mensethius monoceros, Heller, Crust Both. Meer , SB. AK. Wien, XLIII. 1861, 
p. 306. 
Mensethius monoceros, A. Milne-Edwards in Maillard s L ile Beunion, Annexe P, 
p. 6 ; and rugosus p. 7, pi. xvii. fig. 2. 
Menjethius monoceros, A. Milne-Edwards, Nouvelles Archives du Museum 
IV. 1868, p. 70, and VIII. 1872, pp. 252 and 253 (ubi. synon.) 
