1890.] G. M. Giles — Descriptions of new Indian Amphipods. 65 



Maxillipedes moderately large, subpediform. 



The 2nd of the thoracic appendages small, barely subchelate. The 

 3rd of the left side is enormously developed. The propodite alone 

 as long as the first five segments of the thorax and wider than the 

 depth of the body including the coxal plates. The inferior border 

 smooth with one broad lunate projection. The dactylo-podite propor- 

 tionally large. The appendage of the left side barely subchelate and 

 but little larger than the second appendage. The 4th small, and the 5th 

 almost minute. The 6th, 7th, and 8th large, the seventh being the 

 largest and as long as the head and thorax, while the eighth falls but 

 little short of it. 



The gill plates are exceptionally large. 



The abdominal appendages are small, but call for no special remarks, 

 being in every way normal and typical of the genus. 



Hab. Andaman Islands, in shallow water. 



Phoxus uncirostratus, n. sp., PL II, Pig. 2. 



This species was dredged in 5 — 10 fathoms off the " Seven Pagodas " 

 on the Madras coast on a sandy bottom. 



It is about 5 mm. in length and of a uniform dirty white colour. 



The head is small, the arched and excavated rostrum considerably 

 exceeding the head proper in length. The former is long and pointed, 

 and is bent down at the tip so as to form a distinct hook, a feature in 

 which it appears to differ from all the previously described members 

 of the genus. 



The thorax is large, forming nearly half the entire body length, and 

 this portion of the body, excluding the coxal plates, is depressed rather 

 than compressed. The first four coxal plates are very large, exceeding 

 their corresponding segments in depth, the fourth being of exceptional 

 size ; they, besides being the deepest, are of great width, exceeding in 

 this diameter the length of any two of the thoracic segments ; the three 

 hindermost coxal plates, on the other hand, are exceptionally small. 



The abdomen is of moderate size, its first four segments being of 

 nearly equal length, while the last two are extremely small. 



The telson is small and cleft, and is furnished with a few fine 

 hairs. 



The antennule is as long as the head and first thoracic seg- 

 ment together, the peduncle forming rather the shorter portion of the 

 organ. Its first joint is very long and stout, but is almost completely 

 hidden under the excavated lower surface of the rostrum, the remaining 

 two joints of the peduncle being short, and comparatively slight. The 

 flagellum consists of 14 — 16 short articuli, and is but little longer than 

 9 



