212 



Records of the Indian Museum. 



[Vol. XIII, 



length ; the distal portion trends only a little upwards. The basal 

 crest bears 5 equally separated teeth, increasing in size from be- 

 hind forwards ; the hindmost alone is situated on the carapace 

 behind the orbit and the foremost is placed over the articulation 

 between the first and second segments of the antennular peduncle 

 (text-fig. i). There is a single small sub- terminal dorsal tooth and 

 four small, widely separated teeth on the lower margin. 



The branchiostegal spine is fully as large as the antennal ; it 

 is situated a little behind the frontal margin, thus differing from 

 L. tenuipes. The eyes resemble those of the allied species, the stalk 

 being proportionately a trifle larger. The antennular peduncle 

 does not show any marked peculiarities ; the second segment is 

 very short (text-fig. 2). The shorter ramus of the outer flagellum 

 is nearly as long as the peduncle ; it is fused basally with its fellow 

 for a distance not greater than one third the dorsal length of the 

 ultimate peduncular segment. The antennal scale is narrowed an- 

 teriorly and is a trifle more than four times as long as broad (text- 

 fig. 3). 



The oral appendages resemble those of L. tenuipes ; the man- 

 dibular palp is composed of three segments. 



The peraeopods differ conspicuously in their proportions from 

 those of all other known species. The measurements of the separate 

 segments (in mm.) are as follows: — 



It will be noticed that in all the last four pairs of peraeopods 

 the carpus is exceedingly short. In the second legs (text- fig. 4c), 

 which reach beyond the antennal scale by about half the length of 

 the fingers, this feature is specially remarkable, the segment being 

 conical, little longer than broad, recalling that of certain species 

 of the Pontoniid section of the Palaemonidae. In this limb, also, 

 the ischium is conspicuously longer than the merus, resembling in 

 this respect L. styliferus, rather than L. tenuipes. The dactylus of 

 the third peraeopod (text-fig. 4^^) is incomplete; in the fourth pair 

 (text-fig. 4e) it is longer than the propodus, while in the fifth pair 

 (text-fig. 4/) the two terminal segments are of equal length. Very 

 long hairs are to be found on the ischium and merus of the first, 

 third and fourth pairs ; otherwise the limbs are glabrous or with 



