8 CHAS. CHILTON, AMPHIPODA. 



segment of the peraeon and in the transverse palm of the second gnathopod in the 

 fully developed male. Stebbing established the genus Parelasmopus as distinct from 

 Elasmopus mainly because the palp of the mandible is slender and has the second 

 joint smaller than the first or third. Walker has pointed out (1904, p. 275) that 

 the mandibular palp varies in different species of Elasmopus, some »with the third 



Fig. '.i. Parelasmopus suluensis (Dana), adult male. a. First gnathopod. b. Second gnathopod. c. Basal joint of fifth 



peraeopod. 



joint slender, its hind margin straight, and its front margin rather sparsely setose 

 or naked», others »with the 3rd joint strong, the hind margin convex and the front 

 margin pectinate». In view of these facts it seems very doubtful if Parelasmopus 

 can be maintained as a separate genus. 



Distribution. N. W. Australia; British East Africa; Red Sea; Indian Ocean; 

 Sooloo Sea. 



Ceradocus riibroiiiaculatns (Stimpson). 



Ceradocus rubromaculatus Stebbing, 1906, p. 430. 

 » » Chevreux, 1908, p. 479. 



» » Chilton, 1916, p. 369. 



Locality. Forty-five miles W. S. W. of Cape Jaubert, N. VV. Australia, 66 ft. 

 E. Mjöberg, 18.7.11. One specimen. 



In this specimen the right and left second gnathopods are equal in size and 

 shape and have the palm almost regularly convex as is usual in the female. The 

 basal joints of the last three pairs of peraeopods are narrowed and produced below 

 into an acute tooth as figured by Chevreux. I have previously pointed out that 

 the second gnathopods of this species vary considerably, the palm being usually 

 quite oblique, though in the specimens examined by Chevreux from Gambier 

 Archipelago, the palm is almost transverse. 



Distribution. Australia, New Zealand and Gambier Archipelago. 



