262 



Records of the Indian Museum. [Vol. XXIV, 



terminal segment of the antennal peduncle reaches nearly to the 

 end of the antennular peduncle. The antennal scale (text-fig. 906) 

 is a little more than twice as long as troad ; the outer margin is 

 very slightly convex, terminating in a spine which reaches beyond 

 the end of the lamella. 



The incisor-process of the mandible ends in 5 teeth and on 

 the inner side near the apex there is a series of 5 or 6 spinules. 



The third maxilliped (text-fig. 90c) reaches the end of the 

 scale ; the exopod is slender and does not reach the distal end of 

 the antepenultimate segment. The latter is about 275 times as 

 long as wide ; it contrasts strongly in breadth with the two termi- 

 nal segments and is rather longer than the two combined. The 

 penultimate segment is slender, rather less than 4 times as'long as 

 wide and more than twice as long as the ultimate segment. The 

 inner edges of the three distal segments are thickly fringed with 

 hooked hairs which retain debris. 



«,. b c 



Text-fig. 90. — Pontonia okai, sp. now 

 a. Antennule. b. Antennal scale. c. Third maxilliped. 



The first peraeopod reaches beyond the scale by almost the 

 whole length of the chela. The carpus is about three-quarters the 

 length of the merus and is slightly shorter than the chela ; the 

 fingers are about the same length as the palm. There are dense 

 tufts of setae on the fixed finger. 



The second peraeopods are very large, unequal and dissimilar. 

 The ischium in both legs bears a short tooth at the distal end of 

 its lower border. In the larger limb (text-fig. 91^) the merus is 

 2'5 times as long as wide; the carpus is shorter than the merus 

 and is very narrow at the base. The chela is swollen and very 

 heavy and bears a few sparse hairs. The palm is about 2*5 times 

 the length of the merus or fingers and is about twice as long as 



