520 



Polycheria 



2« Joint 



4<'> Joint - 



1. P. antarctioa (Stebb.) 1875 Dexamine a., T. Stebbing in: Ann. nat. Hist., 

 ser. 4 V. 15 p. 184 t. 15a f. 1 | 1878 Atylus antarcticus, T. Stebbing in: Ann. nat. Hist., 

 ser. 5 V.2 p.370 | 1893 Polycheria antarctica, A. DellaValle in: F. Fi. Neapel, «;.20 p.580 

 t. 58 f. 83, 84 I 1888 Tritaeta a. -\- T. kergiieleni, T. Stebbing in: Kep. Voy. Challenger, 

 V. 29 p. 941 ; p. 941 t. 83. 



PleoD Segments carinate except front part of segment 1, 4*^^ produced 

 to a dorsal tooth, 6*'^ raised on each side of base of telson. Head, rostrum 

 obsolete. Side-plates 1 and 2 rather produced and acute at lower front corner, 

 3^ and 4*'^ with subacute lobe in front. Pleon segment 3, postero-lateral 

 corner forming a short acute tooth, which is sometimes obsolete. Eyes large, 

 rounded oval, and (Haswell) red. Antenna 1, 1^* Joint scarcely half as long 

 as 2^, 3^ very short, flagellum rather longer than peduncle, with 20 joints, 

 most with long sensory filaments. Antenna 2 in Q equal to antenna 1^ ultimate 

 Joint of peduncle rather shorter than 

 penultimate, flagellum shorter than 

 peduncle, 11-jointed. Upper lipbroadly 

 and smoothly rounded. Mandible 

 (Fig. 90), spine-row with 3 spines on 

 left, 2 on right mandible. Maxiila 1, 

 inner plate with 2 setae, outer with 10 

 spines, palp with slender spines on 

 apex, 1^* Joint very short, 2*^ very 

 long. Maxiila 2, a few setae on 

 inner margin of inner plate. Maxilli- 

 peds, outer plates very large, reaching 



beyondmiddleofS'^joint 



of palp, inner margin 



fringed with about 20 



small spine-teeth. Gua- 



thopod 1, 5*^1 Joint 



subfusiform, longer than 



the 6"i, 6«! Short oval, 



palm not very oblique, 



finely pectinate, well 



defined, 4*** — 6*11 joints 

 with long spines on bind margin, 6*^ with them also on front. Gnathopod 2 

 similar, but 2'^, 4*^ 5*'^ and 6*^ joints longer. Peraeopods 1 — 5 nearly alike; 

 2^^ Joint in peraeopods 1 (Fig. 91) and 2 broader, not longer than 4*^ in 3^ 

 to 5^^ a little widened proximally, and a little longer than 4*^; in all peraeopods 

 4*^1 as long as 5*^ and 6*^ combiued, 6*^ in peraeopods 1 and 2 rather longer 

 than b^\ in all peraeopods 6*^^ with inner margin produced into a tooth tipped 

 with 2 spines, against which the much curved finger impinges. Branchial 

 vesicles simple in 9, pleated in d. üropod 3, outer ramus shorter than 

 inner (Stebbing), or rami equal (Haswell). Telson elongate, cleft nearly 

 to the base, with several marginal spines, apices tipped each with a spine. 

 Colour yellowish. L. 3 — 8 mm. 



Antarctic ücean (lat. T?** 30' S., depth 548 m, in sponge); South-Pacific (Port 

 .laclcson [East-Australia], depth 4 m; Paterson Inlet [New ZealandJ. depth 19 m); 

 southern Indian Ocean (Kerguelen, depth 51 and 232 m). 



2. P. tenuipes Hasw. 1879 P. t. -f- ?P. brevicornis, Haswell in: P. Linn. Soc. 

 N.S.Wales, vA p. 345 t. 22 f. 8; p. 346 ! 1882 P. obhtsa, G.M.Thomson in: Tr. N. 

 Zealand Inst., «;. 14 p. 233 t. 17 f. 3 | 1898 F. oshorni, Folycharia 0., Calman in: Ann. 

 N. York Ac, u 11 p. 268 t. 32 f. 2; p. 288. 



6"' Joint 



Fig. 90. 

 P. antarctica, 

 'Left mandible 



Fig. 91. P. antarctica. 



Peraeopod 1. 



