122 T. R. R. Stebbing : The Fauna of Brackish Ponds. [VOL. II, 



maxillipeds differ scarcely at all from those of the type species, 

 except in having fewer spines round the apical and inner margin 

 of the outer plates. 



The most striking difference between the two species is afforded 

 by the great first gnathopods of the male, the fifth joint or wrist 

 in the earlier species being two and a half times longer than broad 

 and having a narrow obtuse process on the palmar border, which 

 is wanting to the much shorter wrist of the Indian form. Here 

 the massive fifth joint is less than once and a half as long as broad. 

 The hand is not long enough to reach beyond the wrist's palmar 

 tooth, as it does in the other species, but it is distally broad enough 

 to supply something more of a palm than that species displays. 

 Its finger well overlaps the palmar tooth of the wrist, but to a 

 considerably less extent than in the Madagascar form. 



In the female the first gnathopod is not complexly subchelate as 

 in the male, but simply subchelate. The hand is shorter than the 

 wrist, with the palm rounded, a little oblique, finely denticulate, 

 defined by a palmar spine, which is overlapped by the point of the 

 finger. In both sexes the inner margin of the finger has some small 

 denticles. 



The second gnathopod of the male has the narrow, distally 

 truncate, hand only a little shorter and narrower than the wrist, 

 instead of being considerably smaller in both dimensions as in 

 G. mahafalensis. The hind border of the wrist is strongly fringed 

 with long spines. The apex of the finger reaches a little be^^ond 

 the small palm. In the female the apex of the finger only reaches 

 the end of the palm, otherwise their limbs are nearly alike in the 

 two sexes. The branchial vesicle is narrow, with a constriction 

 near the base, giving it a two-jointed appearance. The marsupial 

 plate of the female is very extensive, and is fringed with setse nearly 

 all round. 



The first and second perseopods are alike, apparently differing 

 from the Madagascar species in the stouter form of the fifth joint, 

 which is little longer than broad. The glandular contents of these 

 limbs indicate that the animal is a tube-builder, and the upward 

 or backward position of the finger in the third perseopods seems 

 adapted for movement in such a dwelling. The third perseopods 

 are very much shorter than either of the following pairs, of which 

 the fifth pair is the longer. The hind margin of the second joint 

 in this pair is fringed with long setae, but by no means so densel}^ 

 as represented in the type species. 



The pleopods have two coupling hooks, each with three pairs of 

 reverted teeth, on the inner margin of the peduncle, the opposite 

 margin being fringed with plumose setae. The first joint of the 

 inner ramus carries three cleft spines. This ramus is decidedly 

 longer than the outer one, although each appears to have about 

 the same number of joints, — twelve to thirteen. 



The first uropods are the longest, the peduncle longer than the 

 subequal rami, all strongly spined. In the second pair the peduncle 

 is about equal to the rami ; in the third it is much shorter than the 



