Icilius 



707 



Lower lip, mandibular processes short, obtuse. Maiidible normal; 3<^ Joint of 

 palp not longer than 2*^. Maxiila 1, inner plate with 2 — 4 setae ou narrow 

 apex, outer with 11 spines: 2*^ Joint of palp with numerous spines and spine- 

 teeth. Maxiila 2, inner plate tbe shorter, inner margin only partially fringed; 

 both plates broad, rather short. Maxillipeds, inner plates broad, outer not 

 very large, fringing spines slender; 2*^ Joint of palp broad, finger slender. 

 Gnathopods 1 and 2 (Fig. 124) simple, slender; 5*'» and 6*^ joints elongate, 

 fringed with long setae. Peraeopods 1 — 5, 2*^ Joint not widely expanded; 

 peraeopod 5 longest. Branchial vesicles simple. Marsupial plates long and 

 broad. Uropod 3, inner ramus longer than peduncle (Fig. 125), outer not 

 longer, very small. Telson simple. 



1 species. 



Fig. 123. 



1. I. ovalis Dana 1852 I. o., J.D.Dana in: P. Amer. Ac, v.2 p. 220 | 1888 

 I. 0., T. Stebbing in: Kep. Voy. Challenger, f. 29 p.255, 265, 1706 | 1893 I. o., A. Della 

 Valle in: F. Fl. Neapel, v. 20 p. 345 t. 55 f. 25— 31 | 1853 & 55 I. ellipücus, J. D. Dana 

 in: U. S. expl. Exp., v. 13ii p.844; t. 56 f.4a— g | 1879 I. australis -f- I.punctatus, Hasvvell 

 in: P. Linn. Soc. N.S.Wales, vA p. 274 t. 12 f. 2; p. 343 t. 23 f. 1 | 1882 I. a., Haswell, 

 Cat. Austral. Crnst., p. 275 t. 4 f . 4, a, b | 1888 I. danae -\- I. ellipticus -j- I. a., T. Stebbing 

 in: Rep.Yoy. Challenger, 17.29 p. 1203 t. 133; p. 1208. 



Back broadly oval (Fig. 123). peraeon Segments 1 and 2 very short, 

 pleon Segments 1 — 3 medio-dorsally acutely produced (Dana); peraeon 

 Segment 7 and pleon-segments 1 and 2 with 2 sets of submedian spinules 

 (sometimes producing the effect of median processes). Head broader than 

 long, with small rostrum 

 and little lobe above the 

 rounded ocular lobe, be- 

 neath which there is a 

 spiniform process. Side- 

 plates 1 and 2 very small, 

 hind margin poiuted, 3^ 

 and 4th with bluntly pointed «" J°*°* ' 

 spinulose hind apex, 5*^ 

 bilobed. Pleon segments 1 

 and 2, postero-lateral Cor- 

 ners sharply pointed, the 

 margin above produced in- 

 to a 2^1 acute process. Pleon 

 Segment 3 smaller, postero- 

 lateral Corners incurved, 

 acute. Eyes prominent, 

 hemispherical, red. An- 

 tenna 1, 1^* and 2^ joints 

 subequal, 3^ much shorter ; 

 flagellum rather longer 

 than peduncle; accessory 

 flagellum a small oblong 

 Joint, tipped with 2 setae. 

 Antenna 2 about twice as long as l^S as long as body; ultimate Joint 

 of peduncle longer than penultimate; flagellum much longer than elon- 

 gate peduncle. Gnathopods 1 and 2 (Fig. 124), 3<i and 4*^' joints very 

 Short, b^^ very long, longer than 2*^, slightly tapering, more in gnathopod 2 



46* 



- — Uropod 1 



-— Uropod 3 



Fig. 124. Fig. 125. 



Fig. 128—125. I. ovalis. 

 Fig. 123. Dorsal view of $. — Fig. 124. Gnatho- 

 pod 2. — Fig. 125. Dorsal view of pleon. 



