MARINE GAMMARIDEAN AMPHIPODA 427 



Three pairs of uropods present (third often minute) (fig. 1566), pereonites 



6-7 free 5 



Two pairs of uropods present (fig. 156a), pereonites 6-7 coalesced .... 8 



Uropod 3 biramous ^ (figs. 156z,j) Icilius 



Uropod 3 uniramous or lacking rami (figs. 156a,/c) 6 



Antenna 1 shorter than antenna 2 (fig. 154c) Podocerus 



Antenna 1 as long as or longer than antenna 2 (figs. 154a, 6) 7 



Coxae 1-4 tiny, separated from each other by a distance more than their 

 width (fig. 1546), pereopods 1-2 shorter than the gnathopods (fig. 1546). 



Neoxenodice^ 

 Coxae small, separated from each other by a distance of one half their width 

 (fig. 155a), pereopods 1-2 longer than the gnathopods (fig. 155a). 



Xenodice^ 



Uropod 2 biramous, large (fig. 156e) Dulichia 



Uropod 2 uniramous, very small (fig. 156c) Paradulichia 



3 Inner ramus of uropod 3 fragile and often missing from specimens but its presence Is indicated by a 

 supporting process of the peduncle. 

 « Uncinotarsus (Aoridae) keys to this position but gnathopod 1 is larger than 2. 



Genera of Podoceridae 



Cyrtophium Dana 



Cyrtophium Dana, 1852b.— Stebbing, 1906. 



Type-species: C. orientale Dana, 1853 (selected by monotypy of 

 Dana, 1853). See Bate, 1862. 



Accessory flagellum absent; antennae subequal in length; pleon 

 with six segments and three pairs of uropods; uropod 2 with two 

 rami, uropod 3 lacking rami. Species: 2, Singapore, E. Australia- 

 littoral. 



Dulichia Kr0yer 



Dulichia Kr0yer, 1845.— Stebbing, 1906. 

 Dyopedos Bate, 1857a,b. 



Type-species: D. spinosissima K.r0'yer, 1845 (monotypy). See Sars, 

 1895. 



Accessory flagellum present; antenna 1 slightly longer than 2; 

 pleon with only five segments and only two pairs of uropods; uropod 

 2 biramous; uropod 3 absent; 'pereonites 6-7 coalesced. Species: 17, 

 arctic-boreal, littoral to abyssal. 



Icilius Dana 



Icilius Dana, 1849; 1852a.— Stebbing, 1906. 



Type-species: /. ovalis Dana, 1852a (selected by monotypy of 

 Dana, 1852a). See Stebbing, 1888 (as /. danae, I. ellipticus, and /. 

 australis) . 



285-135 O - 69 - 28 



