66 DISCOVERY REPORTS 



middle of rami of uropod 3, apex truncate or slightly emarginate according as it is 

 observed in its natural form or flattened, each apex with a spinule and a setule. 



Antenna 1 very stout, 1st joint obese, flattened on inside but dorsal margin not sharply 

 keeled, 2nd joint very short, as broad as 1st, 3rd wider dorsally than ventrally, just 

 visible ventrally on outside but on inside entirely masked by the 1st flagellar joint which 

 is thus in continuity with the 2nd peduncular joint (cf. Kerguelenia antarctica, Brnrd., 

 1930, p. 318, fig. 1 b); flagellum 10-jointed, 1st joint stout, elongate, strongly setose on 

 inner and lower surfaces, the other nine joints short, accessory flagellum 4-jointed, 1st 

 joint elongate, lying in a groove on 1st flagellar joint, setose on its lower margin. No 

 sexual difference except that there are eight short joints following the large 1st joint in ?. 



Fig. 25. Allogaussia navicula, n.sp. a. Antenna 1. b. Antenna 2 (3rd peduncular joint onwards), c. Mandible. 

 d. Gnathopod 1. e. Side-plate 4. /. Side-plate 5 and 2nd joint of peraeopod 3. g. Side-plate 6 and 2nd joint 

 of peraeopod 4. /;. 2nd joint of peraeopod 5. i. Telson. ;. Pleon segments 3-6. k. Uropod 3. /, Profile of 

 epistome and upper lip. 



Antenna 2 slender, 4th joint longest, 4th and 5th strongly setose on upper margins, 

 flagellum 10-jointed in <$, 9 in $. 



Epistome expanding from near bases of 1st antennae into a broad oblong lamina, 

 rounded at upper and lower corners, separated by a deep curved groove from the upper 

 lip, which is gibbous but not projecting beyond the epistome. Mandible, cutting edge 

 somewhat rounded without any denticles, secondary cutting plate and spine row absent, 

 molar well developed, rugulose, palp longer than trunk, inserted about in middle of 

 trunk and behind molar, 2nd joint a little more than twice as long as 3rd, distal half of 

 margin setose, 3rd joint nearly straight, margin setose. Maxilla 1, inner lobe narrow, 

 acuminate, with two feeble apical setules, outer lobe with 8-9 serrate spines, palp ex- 

 tending beyond outer lobe, its truncate apex with 9-10 short stout spinules. Maxilla 2 

 with both lobes narrow, subequal. Maxilliped, inner plate acuminate, without apical 

 spines, outer plate extending to just beyond apex of 2nd joint of palp, inner margin with 



