252 G. M. Giles— ^o^e5 on the Amphipoda of Indian Waters. [No. 3, 



The antennule is more than^rd as long as the body, reaching back 

 as far as the origin of the first pair of branchial sacs. Rather more than 

 half its length is formed by the three-jointed peduncle, whose middle 

 articulus is much the longest, the third joint being very short. It is 

 nearly naked, being armed only with a very few fine, short hairs. The 

 flagellum consists of five joints, of which the first is much the longest, 

 exceeding a good deal, in this respect, the last joint of the peduncle ; 

 each joint is armed with a small hair on its distal extremity above, and 

 with a pair of soft flattened hairs below, the first articulus having two 

 additional pairs of such hairs at equal distances along its lower border 

 indicating probably that the flagellum grows from its base by the inter- 

 calation of additional articuli, as my second male specimen has this 

 joint longer than in that figured presenting an additional pair of hairs, 

 the last being opposite a very indistinct line of division. 



The antenna is somewhat shorter than the antennule, being 

 but l^ths the total length of the creature ; the peduncle is five-jointed, 

 the first two joints being stout, but very short, while the third is but 

 little longer and as slender as the last two articuli, which are very long 

 and subequal and together make up f rds of the entire length of the 

 organ. The flagellum consists of two stout articuli, and, like the pe- 

 duncle, is armed, more especially along its inferior border, with strong 

 simple hairs. 



The gnatJiites appear to be of normal form, the mandibles being 

 provided with a large palp, and the maxillipeds, small, but of pediform 

 outline and clawed. 



The second thoracic appendage is small and takes its origin from the 

 anterior border of the segment, close to the maxillipeds. It is 

 only as long as the third thoracic segment and is but feebly sub- 

 chelate, the propodite being but little dilated. It has, however, some 

 amount of grasping power, as the posterior border of the propodite is 

 armed with a ridge divided into peculiar square-topped teeth, and the 

 dactylopodite is provided with a number of stout tubercular spines. 

 The third thoracic appendage is the longest and largest of the appen- 

 dages, and, though no true palm is developed, is more strongly sub- 

 chelate than its predecessor ; the propodite being much dilated and 

 armed with a peculiar downwardly directed tooth about its middle, and 

 further provided, at the proximal end of the same margin, beyond the 

 reach of the opposition of the dactylopodite, with a strong tubercle armed 

 with a stout spine exactly like those on the propodites of the posterior 

 thoracic appendages by which the animal fixes itself. The third 

 and fourth thoracic segments have no appendages except a pair of simple 

 laminar gill-sacs. The sixth pair of appendages is very weak, but little 



