158 Cyproidea, Stegoplax 



the broader, both short, with 2 or 3 apical spines. Maxillipeds, inner plates 

 with apical m argin produced at inner angle and having a denticle at the 

 outer, 2 spinules on inner surface below tbe apex, outer plates short, broader 

 than inner, not reaching end of l*** Joint of palp, with 2 apical spinules, palp 

 long, 2*^ Joint scarcely as long as P* or 3*^, finger slender, curved. Gnatho- 

 pod 1 subchelate, 5**^ Joint with produced process. Gnathopod 2 complexly 

 subchelate, 5*^^ Joint forming a chehi with 6*^, but not with 7*'\ Peraeo- 

 pods 1 — 5 slender, 2*1 Joint not expanded. Uropods 1 — 3. rami slender, not 

 very unequal, shorter than peduncle. üropod 2 extending beyond uropod 3. 

 Telson entire. 



1 species. 



1. C. omata (Hasw.) 1880 C. sp. (part.), Haswell in: Ann. nat. Hist., ser. 5 v.5 

 p. 31 I 1880 Cyproidia omata, Haswell in: P. Linn. Soc. N.S. Wales, r.4 x>-320 1. 18 f. 1. 



Head small, with small rostrum. Peraeon broad and deep. Pleon 

 folding under, narrow, laterally angled, segment 5 very short, segment 6 

 produced to a point overlappiug but raised above the telson. In lateral 

 view the raised point looks obtuse and the telson pointed, the trae character 

 as Seen in dorsal view being just the reverse. Side-plate 4 much the largest, 

 with rather broad but shallow excavation behind, into which side-plate 5 

 neatly fits, concealing the 6*^ and 7^^. Pleon segment 3, postero-lateral 

 Corners subquadrate. Eyes rather small, rounded. Antenna 1, 2*^ Joint longer 

 than 1^*, produced in triangulär process over half the short narrow 3*^, flagellum 

 slender, with 9 joints canying hyaline sensory appendages, the last 3 joints 

 extremely thin. Antenna 2 rather longer, gland-cone short, obtuse, ante- 

 penultimate Joint of peduncle comparatively long, with one margin sinuous, pen- 

 ultimate Joint narrower, muchlonger, ultimate Joint alittle shorterthan penultimate, 

 but longer than the very thin 3-jointed flagellum including its apical spine. 

 Projecting edge of epistome rounded, shai"p. Gnathopod 1, 2*^ Joint narrowly 

 oblong, rather abruptly widened some distance down, 3*^ at least as long as 4*^, 

 h^^ ti'iangular, bind margin setulose, inner margin and apex of process 

 canying spines, 6*^ tending to oval but front nearly straight, palm long, 

 scarcely defined, matched by the long finger, which has much of inner 

 margin finely serrulate. Gnathopod 2, 2'^ Joint a little widened downward, 

 3*^ very short, but bind apex produced to a long curved narrow process, 

 tipped with a spine, 4*^* with short process, tipped with 2 spines, h^^ with 

 broad base nearly as long as 6^^^, and a taperiug process which reaches the 

 truncate apex of oblong 6*^, the short finger overlappiug the seiTulate 

 rounded angle of the ^^^ and tip of 5*^ Peraeopods 1 — 5, 2«^ Joint long, 

 and naiTow, finger short; in peraeopods 1 and 2, 4*** Joint rather longer than 

 5th Qj. ßth^ ijy^ jjQ^ gQ j^ following pairs. üropod 1, peduncle veiy long, 

 slender, rami much shorter, equal. üropod 2 similar to uropod 1, but shorter. 

 üropod 3, peduncle stouter than in uropods 1 and 2, outer ramus rather shorter 

 than inner. Telson oblong, apex roundly truncate. Colour light pink, with 

 minute brown and red dots forming a lobed pattern on the side-plates. 

 L. reaching 5 mm. 



Port Jackson, Port Stephens and Watson's Bay [Bast-Australia]. 



7. Gen. Stegoplax 0. Sars 



1882 Stegoplax (Sp. un.: S. longirostris), G. 0. Sars in: Forh. Selsk. Christian., 

 nr. 18 p. 88 | 1892 S., G. O. Sars, Crust. Norway, v. 1 p. 232. 



