1898.] A. Alcock — Carcinological Fauna of India. 175 



it is as flat as a coin and is either quite smooth or has only a trans- 

 verse row of granules in the anterior part of the gastric region ; the 

 somewhat pentagonal outline is due to the antero-lateral borders being 

 convergent from a distinct, though obtuse, angle of union with the 

 postero-lateral. 



99. Cymo quadrilobatus, Miers. 



Cymo quadrilobatus Miers, Zool. H. M. S. Alert, p. 533. 



General form as of 0. andreossyi. 



The carapace is covered with a fine close down which does not, 

 however, in the least conceal its sculpture. 



On either side of the carapace just behind the front are two 

 granular transverse elevations ( = Dana's areolae 2 F and 1 M) : the 

 branchio-hepatic regions are distinctly areolated, the areolae having the 

 form of elevated clusters of pearly granules. 



The front is really bilobed, but as each lobe has a deeply concave 

 edge and both angles surmounted by a granular tubercle, it appears 

 four-lobed. 



The three grooves near the outer angle of the (beaded or crenulate 

 and somewhat tumid) orbital margin are very distinct. The anterior 

 half of the lateral margin of the carapace is divided into three granular 

 lobes. 



The chelipeds have the same general form and proportions as in 

 G. andreossyi: they are more or less invested with a fine down, which 

 does not conceal their sculpture : the upper surface of the arm is 

 covered with pearly granules : the upper and outer surfaces of the 

 wrist, and the upper, outer and much of the inner surfaces of the 

 hands, are covered with pearly granules, many of which, on the wrist 

 and in lines along the upper surface of the hand, unite to form 

 large wait-like tubercles : the fingers of the larger cheliped are stout, 

 truncated, blunt pointed and somewhat hollowed at tip ; those of the 

 smaller cheliped, though hollowed, are thin and pointed. 



The legs are thickly covered with fur and long adherent silky 

 hairs, beneath which the whole dorsal surface of the last four joints is 

 granular. 



Colours in spirit : light yellow, with either livid or rich chestnut 

 brown mottled markings on the carapace : fingers of the larger hand 

 whitish, usually with a black base, those of the smaller hand black with 

 white tips ; in both cases the distal half of the lower border of the hand 

 is black. 



Carapace of largest specimen in the Indian Museum collection 15 5 

 millim. long, 16 millim. broad. 



