472 



Memoirs of the Indian Museum. 



[Vol. V, 



fine plumose setae. The endopod is completely branchial in structure and has the 

 margins free from setae. The shape and relative proportions of the different parts 

 of these pleopods will be best learnt from the figures. 



In the female the first and second pleopods are on the whole similar to the third, 

 but with theendopods smaller. They are closely similar to those of L. oceanica and 

 call for no special description. 



The uropods (figs. 20 and 21) in the adult are nearly two-thirds the length of the 

 body ; the basal joint is nearly straight but with a slight curve outwards; it is tri- 

 angular in section, the upper surface being flat and the under surface somewhat 

 keeled, both the inner and lower margins bear 3 or 4 short setules in slight serrations, 

 the last one being situated at the extremity, but the number and position of these 



Ligia exotica, Roux. 



Fig. 19. — Fifth pleopod of male. 



Fig. 20. — Terminal segment with uropod, seen from above. 



Fig. 21. — Under surface of peduncle of uropod from another specimen. 



setules seem to vary considerably in different specimens ; the outer margin is thin 

 and bears no setules but is produced into an acute tooth at the distal end. The two 

 branches are long, slender, tapering, subequal in length and considerably longer than 

 the basal joint; the inner one bears at the extremity a long seta, about one-eighth 

 of the length of the inner branch itself, but longer in proportion in very young 

 specimens. 



The length of the uropods varies to a considerable extent with the development 

 of the animal, but in the Lake Chilka specimens does not appear to be ever very 

 much greater than half the length of the body. These appendages are, however, so 

 easily detached from the body that it is difficult to get many specimens for which 

 precise measurements can be given. In some of the Honolulu specimens of the 

 species the uropods are rather longer, being fully two-thirds the length of the body; 



