1890.] G. M. Giles — Descriptions of neiv Indian Amphipods. 71 



the east coast of Greenland. Our species was dredged in 30 fathoms, 

 in Manner's Straits, Andaman Islands. Found crawling upon a Penna- 

 tiila, the pink and white colours of which are almost exactly imitated 

 in the amphipod. 



The distribution of the colouring varies in different specimens. In 

 one, the head and body as far as the fourth thoracic segment and the 

 entire abdomen were pink, while the remaining middle zone of the body 

 was of an opaque glistening white. In another, the distribution was 

 almost reversed, the pink forming a broad band in the middle of the 

 animal. In a third it was almost confined to the hinder part of the 

 body. In all, however, the tints were the same, the pink parts having 

 a uniform transparent character diversified by minute opaque spots of a 

 darker tint, while the white was remarkable for its dead opacity. 



The largest specimen measured about 7 mm., the smallest little 

 more than 2 mm. 



The head is rather long and cylindrical, its anterior half being 

 almost completely covered by the eyes, which are of a pink colour, 

 deeper than any other part of the body. 



The remainder of the length of the body is almost exactly divided 

 between thorax and abdomen, the latter, however, being much the 

 deeper. The segments of the thorax are of nearly equal length through- 

 out, but the more posterior are much the deeper. In the abdomen the 

 third segment is considerably the longest, while the second exceeds the 

 rest in depth, as well as all, save the third, in length. 



The fourth abdominal segment is nearly as long as the first, but 

 very narrow, while the last two are very small in all dimensions. 



The telson is simple and squamiform, equalling in length the 

 protopodite of the sixth abdominal appendage. It is armed with a few 

 fine hairs. 



The first four coxal plates are very deep and broad, the fourth being 

 the largest, the last three comparatively small. Spence Bate (Ann. 

 Nat. Hist. Ser. 3, Vol. I, p. 362, 1858), in his definition of the genus, 

 states that the " Coxa of the second pair of pereiopoda " (fourth coxal 

 plate) is " very deeply excavated upon the upper part of the posterior 

 margin to receive the coxas of the third pair of periopoda." This is, 

 however, more apparent than real, at any rate in the present species ; 

 the appearance being the optical expression of the fact that the fifth 

 coxal plate overlaps the fourth as well as the sixth, the upper part of 

 the former not being remarkably excavated, but narrowing uniformly to 

 its articulation with the pleuron of its segment. 



The antennule has a three-jointed peduncle not exceeding the head 

 and first thoracic appendage in length. The first joint is somewhat 



