72 G. M. Giles — Descriptions of new Indian Amphipods. [No. 1, 



longer than the second, while the third is very short. The flagella 

 of both antennae vary somewhat in length in various specimens, the 

 number of articuli, however, remaining about the same, the increase being 

 gained by an elongation of all the pieces. In the specimen figured the 

 flagellum but slightly exceeds the peduncle in length, but in others 

 it was considerably longer. There is no appendage to the flagellum. 



The first three joints of the peduncle of the antenna are very short 

 and, except the end of the third, hidden beneath the excavated cephalon. 

 The last two joints equal in length the first two of the antennule. 

 The flagellum also vaines in length, but is always about a third shorter 

 than that of the antenuule. 



The gnathites were not dissected out, but a mandibular appendage 

 was distinguished, and it could be seen that the maxillipeds are small 

 but pediform. 



The two pairs of gnathopoda closely resemble each other alike in 

 size and form. Both are feebly subchelate, with the palm oblique, 

 the propodite forming about one-third of the entire length exclusive 

 of the dactylopodite. Their carpo- mero- and ischiopodites are shorter 

 than their breadth, while the basipodites form nearly a half of the 

 length of the appendage exclusive of the dactylopodite. 



The 4th and 5th thoracic appendages are of the usual ambulatory 

 type, are subequal to each other, and, in length, to the gnathopoda, 

 each being as long as the head and first five thoracic somites. They 

 are very slender and closely resemble each other in all particulars. 

 The 6th, 7th, and 8th closely resemble each other in all points save 

 in size, each being stoutly built and having the basipodite provided 

 with a strong buttress-like plate along the posterior border. The 7th 

 and 8th are subequal, being as long as the thorax and the first two abdo- 

 minal segments, but the sixth is about one-sixth shorter. 



The first three abdominal appendages are small, but quite of the 

 usual type. The last three are biramous, with equal rami ; the fourth 

 being the longest and the sixth the shortest of the three. The fourth 

 and fifth have their rami armed with stout spines, while the sixth has 

 only fine hairs. 



Ctetophium andamanense, n. sp., PI. II, Fig. 7. 



Taken in the surface net at Port Mouat, Andaman Islands. Only 

 a single specimen was obtained and this was swimming free, nor could any 

 trace of a tube he found ; probably this had got destroyed by the wash 

 of the tide. 



The animal is about 3 mm. long and of a dirty white colour, 

 sparely sprinkled with minute dark brown spots. 



