608 " THETIS " SCIENTIFIC RESULTS. 



stiff setse, of which the third is the longest. The third, fourth, 

 and fifth peraeopods are successively longer, the increase depend- 

 ing chiefly on the fifth and sixth joints. In all three pairs the 

 second joint is broadly expanded, with the hind margin setose, 

 the last four joints are reverted, and the short finger is uncinate. 

 In the third and fourth pairs there are moderately strong spines 

 on the front (by reversion the hind) margin of the sixth joint. 

 In the fifth pair the spines are minute. 



The pleopods have two small coupling-hooks. The rami are 

 unequal, not very numerously-jointed. 



The first uropods have a long spine-process at apex of the 

 peduncle. The rami are rather longer than the peduncle, sub- 

 equal, with several spines on the margin. The second uropods 

 are similar, on a smaller scale. The third uropods have a short 

 peduncle, which is both stouter and longer than the single ramus, 

 which terminates in several setfe, among which may be discerned 

 a tubercular microscopic second joint. 



The telson is simple, about as long as broad, surmounted by a 

 submedian pair of setules, and having a little prominence on 

 either side of the rounded apical border. Length of adult, from 

 front of head to end of seventh peraeon segment, 3-75 mm. 



The specific name alludes to the peculiarity for a member of 

 the Aoridse that the third uropods have but one ramus. 



Locality. — Ofi" Manning River. Two specimens, of which one 

 is obviously an adult male, the other is probably a female with 

 the marsupial plates undeveloped. 



Family PHOTID^. 



Photidm, Boeck, Skand. Arkt. Amphip., i., 1872, p. 74; ii., 1876, 



p. 546. 

 Photidce, Walker, Herdman's Rep. Ceylon Pearl Oyster Fish., 



ii., 1904, p. 234. 

 Fhotidce, Stebbing, Das Tierreich, xxi., 1906, pp. 603, 737. 

 Photidce, Walker, Nat. Antarctic Exp., iii., 1907, pp. 5, 35. 



Genus PHOTIS, Kroyer. 



Photis, Kroyer, Naturh. Tidsskrift, iv., 1842, p. 155. 



Photis, Walker, Herdman's Rep. Ceylon Pearl Oyster Fish., ii., 

 1904, p. 286. 



Photis, Stebbing, Das Tierreich, xxi., 1906, pp. 605, 738. 



In 1904, Mr. A. O. Walker added to this genus the new species 

 P. longimanus from Ceylon watei^s, and from the same region 



