212 G. M. Giles — Notes on the AmpTiipoda of Indian Waters. [No. 3, 



The antennule is a little more than a third of the body length, 

 reaching back to nearly the end of the 4th thoracic segment. Its 

 peduncle is moderately stoat and forms more than half the length 

 of the organ. Of its three articuli, the first is the longest and stoutest, 

 the second, nearly as large, and the third, very small, is dotted 

 along its inferior border with a number of long fine hairs, but, with 

 the exception of a few short fine hairs, is naked above. The flagellum 

 tapers gradually, and is formed of 13 — 14 short joints, each of which is 

 distally armed with a few short stifiish hairs. 



The anteyina exactly equals the antennule in length, but is much 

 stouter and subpediform. The peduncle forms fths of the entire 

 length of the appendage ; its first three joints are very stout, but in 

 length together only equal the 4th, which is subequal to the 5th. The 

 proximal segments are pretty liberally clothed with long hairs, and the 

 last with hairs shorter and almost spinous. The flagellum consists of 

 9 — 11 very short joints, each of which is armed distally with a circlet of 

 short stiff hairs. 



The gnatliites are rather small and inconspicuous, but the mandible, 

 which is provided with a small appendage, is of remarkable complexity, 

 its triturating portion being subdivided into three distinct, but immovably 

 connected, plates, each armed with dentations of progressively increasing 

 severity. The deepest of these three plates is armed, in addition, with 

 a number of compound sifting hairs. 



The maxillse and maxillipeds are small, but quite of the usual type. 

 The second and third thoracic appendages (gnathopoda) are small 

 and rather weakly subchelate. The palm of the propodite of the 1st 

 gnathopod is fairly marked, but has its angle round and not produced 

 into an opposible ramus, while that of the 2nd gnathopod has the palm 

 even less pronounced, being retracted and excavated ; both have a pair 

 of stout spines near the angle between which the dactylopodite closes. 

 In both, the dactylopodites are feebly serrate, and the carpo-meropodital 

 articulations, oblique. The fourth and fifth thoracic appendages are 

 subequal in length to the gnathopoda ; both are somewhat slighter 

 and quite of the usual ambulatory type. The sixth, seventh, and 

 eighth thoracic appendages resemble each other closely in general 

 plan, but differ greatly in length, the sixth being subequal to the 

 appendages in front of it and a little more than jth the body length, 

 while the seventh is fully a third, and the eighth, a sixth, longer 

 than the seventh. All three have the basipodites strengthened by 

 buttress plates, those of the sixth being placed in front as well as be- 

 hind the cylindrical portion of the articulus, while, in the 7th and 8th, 

 the buttress is placed entirely behind. The basipodites certainly do 



