1898.] A. Alcock — Carcinological Fauna of India. 123 



Legs rough, but not very hairy : upper edge of meropodites finely 

 serrated, distally sharply notched : upper surface of carpopodites wUh two 

 high longitudinal crests enclosing a trough-like space ; the propodites are 

 similarly sculptured, but the sculpture is a good deal concealed by fur : 

 dactyli furred. 



Colours in spirit : dirty yellow or dirty greenish, fingers nearly 

 black in distal £ only. 



In the Indian Museum are 4 specimens, from the Andamans, Mergui 

 and Ceylon. 



Me as: us, Dana. 



Medseus, Dana, Silliman's Amer. Jonrn. Sci. and Arts, (2) XII. 1851, p. 125; 

 Proc. Ac. Nat. Sci. Philad. 1852, p. 76; U. S. Expl. Exp. Crust, pt. I. p. 181. 



Medseus, A. Milne Edwards, Ann. Sci. Nat. Zool. (4) XX. 1863, p. 279; Miss. 

 Sci. Mex. Crnst. p. 249. 



Medveus, Miers, Challenger Brachyura, p. 116. 



Carapace not very broad, hexagonal, little convex, the regions well 

 defined and well areolated. 



Antero-lateral borders cut into teeth and very distinctly continued 

 beneath the orbits to the angles of the buccal cavern. 



Fronto-orbifcal border half, or a little more than half, the greatest- 

 breadth of the carapace. 



Front about a fourth, or a little more, the greatest breadth of the 

 carapace, horizontal, rattier prominent, square-cut, notched in the middle 

 line, separated from the supra-orbital margin by a notch. 



Orbits, eyes, basal antennal joint and antennary flagellum as in 

 Xantho. 



Chelipeds either unequal or subequal, the wrists and hands com- 

 monly covered with large nodules, the fingers pointed. 



The abdomen of the male consists of five pieees, the 3rd— 5th somites 

 being fused. 



Medseus closely resembles Xantho^ but is distinguished by the 

 narrower carapace and by the relations of the antero-lateral border. In 

 some species of Xantho (e.g., X. distingnendus) the antero-lateral border 

 is broken and eroded near the orbit, so that it may be imagined to be 

 continued to the angle of the buccal cavern, but in Medseus there is no 

 ambiguity whatever. 



50. Medseus nodosus, A. M. Edw. 



Medseus nodosus, A. Milne Edwards, Ann. Soc. Ent. France, (4) VII. 1867, 

 p. 271 ; Nouv. Archiv. du Mus. IX. 1873, p. 212, pi. viii. fig. 2 : Haswell, Cat. 

 Anstral. Crnst. p. 52. 



Carapace shaped much as in Polycremnus, hexagonal, more than j 



