AMPHIPODA. 287 



The segments of the urus decrease successively in length; the 1st has a dorsal 

 depression. 



The uropods are subequal in extent, short and stout ; the outer rami in the 1st 

 and 2nd rather shorter than the inner and about half as long as the peduncles, 

 without terminal spines or setae. The 3rd pair has the inner ramus almost rudi- 

 mentary, the outer curved, rather longer than the peduncle, with a minute terminal 

 joint and 1 or 2 slender spines on it. With the exception of 2 or 3 setules on the 

 telson, the urus appears to be entirely destitute of setae. 



Telson not quite reaching the end of the peduncle, of the usual form. 



Length 3 millims. 



Colour in spirit yellowish, with a few dark-red blotches on the body and limbs. No 

 female was observed. The species may be distinguished by the peculiar form of the 

 wrist and hand of the 2nd gnathopods. 



Photis nana, n. sp. Plate VII., figs. 45. 



Pearl oyster washings, Muttuvaratu, 19th Nov., 1902. Two females with ova. 



Head longer than the first 2 segments. Ocular lobe distinct, but not prominent. 

 Eye round, rather small. 



Posterior angle of the 3rd pleon segment rounded. 



Antennas subequal in length and width, except the 1st joint of the upper, which is 

 at least twice as wide as any of the other peduncular joints ; both pairs are almost 

 naked. In the upper pair the 3 joints of the peduncle are subequal in length, the 

 1st with a group of setaa at the distal end; the flagellum about as long as the last 

 2 joints of the peduncle, with 3 rather long subequal joints and a minute terminal 

 one which, as well as the 2 preceding, has one or two strap-shaped setae at the end. 

 The lower antennae have the 1st joint very short ; the 2nd shorter than the 3rd ; the 

 flagellum as long as the peduncle. 



First gnathopods : 1st joint curved, as long as the next 3 ; wrist about two-thirds 

 as long as, but wider than, the hand, with a group of setse on the convex hind margin. 

 The hand narrows distally to the base of the dactylus, the distal half of the hind 

 margin setose (fig. 45. gn. l ). 



Dactylus with a spine and 2 setules on the inner margin, which is finely pectinate. 



The 2nd gnathopods resemble the 1st in size and form, but the 1st joint is less 

 curved and the 3rd has the end of the hind margin squarely truncate (fig. 45. gn.-'). 



First and 2nd perseopods : 1st joint pyriform, longer than the next 3, the hind 

 margin convex and setose at the distal end (fig. 45. pp. 1 ). 



Third perasopods as in P. reinhardi, but without seta?, except one at the end of the 

 hind margin of the 4th joint and one at the base of the dactylus. 



Fourth and 5th perseopods as in P. reinhmrdi, except the 1st joint, which is more 

 oblique and the whole less setose. 



The uropods are without spines or setae, except at the ends of the joints. The 3rd 



