1898.] A. Alcock — Carcinolugical Fauna of India. 225 



coarse blunt claw : the meropodites are singularly broad and flat : the 

 dactyli and propodites have both edges, and the carpopodites the upper 

 edge, somewhat hairy. 



Colours in spirit rather variable : sometimes uniform yellow or 

 brown, usually the edge of the front and of the anterior part of the 

 lateral margin is darker — almost black ; occasionally the ends of some 

 of the leg-joints have a black spot, and sometimes the legs are broadly 

 banded yellow and blackish-brown. 



Ln the Indian Museum are 78 specimens, from the Andamans, 

 Mergui, Ceylon, the Maldives and the Mekran coast. 



In some but not in all young specimens there is a small lateral 

 spine placed far forward on either lateral border of the carapace. 



Quadrella, Dana. 



Quadrella, Dana, Silliman's Amer. Journ. Sci. and Arts (2) XII. 1851, p. 128, and 

 Proc. Ac. Nat. Sci. Philad. 1852, p. 84, and U. S. Expl. Exp. Crust, pt. i. p. 265. 

 Quadrella, A. Milne Edwards, Miss. Sci. Mex. Crust, p. 344. 



Carapace squarely hexagonal, nearly as long as broad, moderately 

 convex, perfectly smooth without trace of regions. 



The anterolateral borders, which are about equal in length to the 

 postero-lateral, are straight, slope very slightly outwards, and join the 

 postero-lateral at a very wide, but distinct, angle, marked usually by a 

 spine. 



The fronto-orbital border is about equal in extent to the greatest 

 breadth of the carapace, and the broad almost horizontal front is cut 

 into four acute spines, external to which, on either side, is seen the acute 

 spiniform internal angle of the lower edge of the orbit projecting 

 beyond the acute supra-orbital angles ; so that the front is commonly 

 spoken of as six-spinate. 



The orbits, which are small and are cut out of the antero-lateral 

 angles of the carapace, afford no concealment to the eyes : their upper 

 and lower inner angles are in contact so as to exclude the antennas. 



The antennules fold almost transversely. The basal antennal joint 

 is slender and does not nearly reach the front ; the flagellum is slender 

 and long — nearly half the length of the carapace. 



The crests of the endostome are distinct and the expiratory canals 

 are closed in as in Trapezia, etc. 



The chelipeds are massive but are of great length, the whole of 

 the long arm projecting beyond the edge of the carapace : they are 

 subequal, or not markedly unequal, in both sexes. 



Legs long and slender, the dactyli strongly and evenly serrated 

 along the inner edge. 

 J. II. 29 



