1890.] G. M. Giles — Descriptions of new Indian Amphipods. 67 



the comparative shortness of the limbs, and appears to most nearly 

 resemble A. australis, Haswell, from which, however, it differs in the 

 comparative length of the joints of the thoracic appendages. 



My specimen was 11 mm. long ; of a pale brown colour liberally 

 marked with patches of a deep brown. 



The head is small and oval, the two pairs of simple eyes being 

 placed respectively opposite the origins of the autennules and antennae. 



The thorax forms more than half the body length, its four anterior 

 segments increase progressively in length, but the three hinder are 

 subequal and longer than any of the other segments, thoracic or 

 abdominal. The first four coxal plates are deeper than their corre- 

 sponding segments, the fourth being the deepest, and also exceptionally 

 broad. The fifth coxal plate has an anterior lobe of moderate depth, 

 and has the hinder border of the posterior lobe subdivided by a notch 

 into two lobules, of which the upper is the smaller. 



The abdomen forms rather more than one-third of the entire body 

 length, its first three segments are subequal in length, and each is as 

 long as the remaining three together. Their depth is moderate, not 

 exceeding that of the thoracic segments with their attached coxse. 



The telson is small, squamiform, and deeply cleft. 



The antennule is very minute, being barely as long as the head 

 and first thoracic segment ; the first joint of the peduncle is moder- 

 ately stout, but the remaining two joints can barely be distinguished 

 from the articuli of the flagellum, especially the third, which but little 

 exceeds them in length. The peduncle forms about one-third of the 

 entire length of the organ. 



The antenna is more than twice as long as the antennule. Its 

 first two joints are short and moderately stout, while the distal three 

 are very long and slender, the third being the longest and the fifth 

 the shortest ; the flagellum is composed of a number of long slender 

 articuli, but was broken off, so that the entire length could not be ascer- 

 tained. 



The gnathites are completely hidden beneath the opaque first coxal 

 plate. 



The second and third thoracic appendages (gnathopoda) are small, 

 and have the propodite merely dilated without forming a true subchela. 

 The third is somewhat the larger. The fourth and fifth are of similar 

 form, but the fifth is a little the larger, the fourth being as long as the 

 head and first four thoracic segments. In both, the meropodites are 

 peculiarly long and the carpopodites very short. The last three 

 are remarkable in having their dactylopodites curved backwards, instead 

 of forwards, as is usually the case. The sixth and seventh have the 



