Amphipoda and Isopoda 217 



in length, but the posterior two narrower than any of the preceding ; 

 coxal plates well developed on all segments, those of the first segment 

 apparently fused to the segment anteriorly, but free posteriorly. 



Metasome (Plate V., Fig. 1) with the epimeral plates well 

 developed, slightly produced posteriorly, with their hinder margins 

 broadly emarginate. 



Eyes absent. 



Superior antenna; (Plate V., Figs. 1 and 2) not longer than the 

 cephalon plus the first segment of the mesosome ; peduncle three- 

 jointed, the last joint the longest ; flagellum slightly longer than the 

 peduncle, and composed of eight joints. 



Inferior antennae (Plate V., Figs. 1 and 2) about 22 millimetres in 

 length, longer than the body and very slender ; peduncle five-jointed, 

 the last joint the longest ; flagellum composed of more than seventy 

 joints ; last two joints of the peduncle and the proximal half of the 

 flagellum ornamented profusely with numerous very long, delicate 

 plumose setae. 



Mouth parts not examined, but judging from other characters of 

 the species, probably closely resembling those of the genus Syscenus. 



First three pairs of legs (Plate V., Fig. 4) comparatively short 

 and very strong and stout, unarmed ; carpus quite small ; propodus 

 cylindrical, not expanded ; dactylns remarkably strong, hooked, 

 sharply curved at the centre, tip very sharp and darkened in 

 colour. 



Fourth pair of legs (Plate V., Fig. 5) moderately slender ; ischium 

 with its outer distal corner produced into a lobe extending almost to 

 the centre of the merus and armed with four stout spines, a similar 

 spine on its inner distal corner ; merus longer and stouter than the 

 carpus, with two and one spines on its outer and inner distal corners 

 respectively ; carpus with two small spines on its inner edge and two 

 larger spines on its inner distal corner ; propodus long and narrow, 

 equal in length to the carpus and merus combined, armed with four 

 small spines on its inner edge ; dactylus moderately stout and slightly 

 curved ; a few long, fine plumose seta; on the inner edges of the 



