joint is shorter than the sixth, hirsute along two edges, the 

 fifth has a prominent tooth, the sixth on the right limb has 

 the thumb shorter than the trunk of the joint, on the left, 

 limb scarcely shorter, in both with an acute apex and an 

 irregularly denticulate or tuberculate margin, the teeth or 

 tubercles along the finger more or less fitting the interstices , 

 along the thumb. In the four following pairs of limbs the 

 sixth joint is very short and apically narrow ; all the joints 

 have hairy fringes, but on the seventh the single fringe is, 

 continuous nearly to the apex along the convex margin only 

 in the last pair, in the three preceding pairs being limited to a 

 short proximal space. 



OXYRRHYNCHA. 



Fam. : I\Iaiidae. 



1895. Maiidae, Alcock, Materials for a Carcinological Fauna 

 of India, No. i, p. 160. 



Gen. : Dehaanius, M'Leay. 



1834. Acanthonyx (part), Alilne-Edwards, Hist. Nat. Crust., 



vol. I, p. 342. 

 1838. DehaaniuSy M'Leay, in Smith's Illustrations of the 



Zoology of South Africa, Annulosa by W. S. 



M'Leay, p. 57. 

 1^839. Dehaanms, de Haan, Siebold's Fauna Japonica, Crust., 



part 4, p. 83. 

 1843. Acanthonyx, Krauss, Die Siidafrik. Crust., p. 47. 

 1852. Dehaanius, Dana, U. S. Expl. Exp., vol. 13, part 1, 



p. 79. 

 1879. Dehaanius, Miers, J. Linn. Soc. London, vol. 14, p. 650. 

 iSSd. Dehaanius, Miers, Challenger Brachyura, Reports, 



vol. 17, part 49, p. 39. 



Carapace sub-quadrate between the antero-lateral lobes 

 and the trilobed hind margin, rostrum bifid, praeocular tooth 

 prominent, postocular small. Pleon, in the male, seven- 

 jointed. Eyes small, mobile. Base of second antennae 

 slightly dilated at the middle, distally narrowed. Third 

 maxillipeds having the third joint narrow at the base, then 

 wide, the tubercular inner margin leading to a rounded 

 apical lobe, the shorter fourth joint similarly produced, but 

 with the truncate apical part forming a squared lobe, 

 partially folded beneath the rounded one, but not reaching 

 its inner edge ; to the inner edge of the squared lobe is 

 attached the fifth joint, which is widest distally, while the two 

 following joints are more conical. The exopod has the outer 



