1908.] Records of the Indian Museum. 225 



end of the endopodite of the caudal fin; this is not the case in 

 Pal. carcinus ; the telson ends in an acute point which reaches 

 beyond the short, outer pair of subterminal spinules, whereas the 

 long, inner pair extends far beyond the median spine. The telson 

 is somewhat flattened on its posterior half, and the two pairs of 

 spinules on the upper surface are placed as in Pal. carcinus ; in 

 the largest specimen from Port Canning there are three spinules 

 on the left side and two on the right. 



The shortest antennular flagellum which, as in Pal. carcinus^ is 

 united with the outer for a very short distance, exceeds the antennal 

 scales b}^ two-thirds of its length ; free end of the antennal scales 

 obtuse, reaching far beyond the outer spine. The third or distal 

 joint of the mandibular palp is once and a half as long as the second; 

 the third joint carries five setae, two of which at the distal end are 

 a little longer than the joint itself. External maxillipeds as in 

 Pal. carcinus, extending with half their terminal joint beyond the 

 tip of the antennal peduncle. 



The first pair of legs reach to the spine at the far end of the 

 outer margin of the antennal scales. The slender carpus, which is 

 somewhat thickened distalh^ is one- fourth longer than the merus, 

 which is nine times as long as broad and broader than the carpus ; 

 the chela is almost half as long as the carpus, its length being to 

 that of the carpus as 4 : 9 ; the fingers are one-fourth longer than 

 the palm. In the largest specimen from Port Canning the merus 

 is 2"75 mm. long and 0*3 mm. broad ; the carpus is 3*4 mm. long, 

 the chela i"52 mm., the palm o"68 mm., the fingers 0*84 mm. ; 

 in a specimen from Calcutta which is 29 mm. in length, the merus 

 is 2*3 mm. long and 0*23 mm. broad, just ten times as long as 

 broad; the carpus 2*7 mm. long, the chela 1*26 mm., the palm 

 0*62 mm., the fingers 0'64 mm. 



The second legs (fig. ^e) project with one-fourth of their propo- 

 dites beyond the antennal scales and are twice as long as the cara- 

 pace, rostrum excluded. The merus measures one-fourth the whole 

 leg and is eleven times as long as broad ; the carpus, which has a 

 slenderer shape, and which thickens at the distal end, is just once 

 and a half as long as the merus, almost twice as long as the chela and 

 three times as long as the palm. The palm (fig. 4/) is a little longer 

 than the fingers ; it is a little broader than the distal extremity of 

 the carpus and once and a half as broad as thick, being slightly 

 compressed. Of the largest specimen from Port Canning, the cara- 

 pace of which is 6*75 mm. long without the rostrum, the merus is 

 3'35 mm. long and 0*3 mm. broad ; the carpus is 5*1 mm. long, 

 the chela 2*97 mm., the palm i'6 mm. and the fingers 1*37 mm. 

 In one of the largest specimens from Calcutta (carapace 4*8 mm. 

 long without the rostrum) the merus is 275 mm. long and 0"2 mm. 

 broad, the carpus 3*9 mm. long, the chela 2*26 mm., the palm 

 I "15 mm., the fingers I'li mm. ; in a younger specimen from Calcutta 

 (carapace 37 mm. long without the rostrum) the merus is 1*9 mm. 

 long and 0"i6 mm. broad, the carpus 275 mm. long, the chela 

 I '65 mm., the palm 0*84 mm., the fingers o*8i mm. 



