1888.] G. M. Giles — Notes on the Ampliipoda of Indian Waters. 253 



longer than the segment from which it springs, and quite of the usual 

 ambulatory type. The seventh and eighth pairs are large and powerful 

 and are used by the animal to anchor itself to any suitable object; they 

 resemble each other closely in general form, but the eighth is much the 

 larger, the seventh being only as long as the 1st and 3rd thoracic seg- 

 ments, while the eighth is as long as the 2nd, 3rd, and 4th thoracic seg- 

 ments together. Each has the basipodite rather stout and the meropo- 

 dite and carpopodite of very moderate size, the main part of the length 

 of these appendages being formed by the propodite and dactylopodite, 

 which are of great size and strength ; the dactylopodite being stout and 

 falciform, and the propodite being provided at its proximal extremity 

 with a tubercle and spine like that already described as similiarly 

 situated on the 3rd thoracic appendage. By means of the grasp 

 obtained between this and the point of the dactylopodite, the animal 

 is able to attach itself to such comparatively smooth surfaces as the 

 interior of a leaden ring which formed the walls of the cell in which 

 it was confined. . 



The female differs from the male in the following points : — 



1st. She is larger and proportionately stouter. 



2nd. She is provided with an egg-pouch attached to the 3rd and 

 4th thoracic segments. This is large and deep ; the laminae of the 

 3rd segment being directed downwards and backwards, and their 

 posterior border overlapped by those springing from the 4th segment. 

 During life these laminae are kept in constant motion so as to produce a 

 continuous current of water round the contained ova. 



3rd. No trace of the abdomen or its appendages can be made out. 



Observing the living animal, I was much struck with the activity of 

 its circulation, which is much more active than in any other amphipod 

 that has come under my notice, the lymph current flowing as rapidly as 

 in the highest crabs. 



12. Caprella palkii. n. sp., PI. XII, Fig. 3. 



This species closely resembles the preceding, so much so that, a 

 single immature female only having been obtained, I am in some doubt 

 as to whether or not it is a distinct species or merely a stage of G. mad- 

 rasana. On the whole, however, I am inclined to think that it is speci- 

 fically distinct. 



The specimen was dredged in 7 fathoms in the mouth of Palk's 

 Straits, and was clinging to some Sargassum weed. The differences 

 between the two species are as follows : — 



1st. The 1st thoracic segment is proportionally shorter. 



2nd. The 3rd and 4th thoracic segrments are each armed with two 



