Polycheria, Guernea 521 



Closelj resembles P. antarctica, but differs in the following respects. 

 Dorsal processes of pleon Segments 4 and 6 much less prominent. Side- 

 plate 4 with anterior process reduced to a short blunt lobe. Maxiila 1 with 

 1^* Joint very short, 2*^ very long (l-jointed: Calman). Maxillipeds with outer 

 plates louger, nearly equalling palp, and armed with only about 11 spine-teeth 

 on inner margin. Gnathopod 1 with palmar edge very short, not more than 

 7a as long as finger; gnathopod 2 with 6^'^ Joint twicc as long as broad, 

 palmar edge about Va ^s long as finger. Peraeopod 3 with front and bind 

 margins of 6^'' Joint nearly parallel, and thumb-like process much less 

 prominent. L. $ 7 mm. 



Paget Sound. 



5. Gen. Guernea Chevreux 



1868 Helleria (Sp. uii.: H. coalita) {non Ebner 1868, Isopoda!), A.M.Norman 

 in: Ann. nat. Hist.. ser.4 v.2 p.418 \ 1887 Giteraea, Chevreux in : Bull. Soc. zool. France, 

 ul2 p. 302 I 1890 a., T. Stebbing in: Ann. nat. Hist., ser. 6 v.5 p. 192 | 1893 G., A. 

 UellaValle in: F. Fl. Neapel, ».20 p. 570 | 1887 Prinassus (Sp. un. : P. nordenskiöldii), 

 H. J. Hansen in: Vid. Meddol., ser.4 v.9 p. 82. 



Pleon Segments 5 and 6 coalesced, abruptly truncated behind. Head, 

 rostrum obsolete. Side-plate 5 the largest. Antenna 1 in ö much shorter 

 than antenna 2. Upper lip rounded. Lower lip with inner lobes well developed. 

 Mandible, cutting edge obscurely dentate, with accessory plate but no apparent 

 spine-row, molar represented by a laminar fold. Maxiila 1, inner plate with 

 1 setule, outer with 7 spines, palp with 1*^* Joint slightly longer than 2'^. 

 Maxiila 2, inner plate with 2 (1?) setae, outer plate longer, with a few 

 setae. Maxillipeds, inner plates rudimentary, outer plates reaching middle 

 of ii^ Joint of palp, fringed with spine-teeth on distal part of inner margin, 

 finger of palp small. Gnathopods 1 and 2, 6*'' Joint subquadrate. Peraeo- 

 pods 1 and 2, 4*'^ Joint much longer than 5*^; 2*^ Joint smaller in peraeo- 

 pod 4 than in 3 or 5 ; peraeopod 5 with 4**^ and 5*'^ joints wide and plumose. 

 Uropod 3, rami lanceolate, not much longer than peduncle. Telson rather 

 longer than broad. 



2 species accepted, 1 doubtful. 

 Synopsis of accepted species: 



Gnathopod 1, Qi^ Joint decidedly longer than broad; 



peraeopod 5, 2<i Joint much narrowed distally. . , 1. G. coalita p. 521 



Gnathopod 1, 6th Joint scarcely longer than broad; 



peraeopod 5, 2d Joint little narrowed distally ... 2. G. nordenskiöldii . p. 522 



1. G. coalita (Norm.) 1868 Helleria c, A. M.Norman in: Ann. nat. Hist., ser.4 

 v.2 p.4l8 t.22 f.8; t. 23 f. 1—6 | 1888 Guerneac, T. Stebbing in: Rep. Voy. Challenger, 

 v:29 p. 595, 596, 386 ! 1893 G. c. (part.), Chevreux & E. LT Bouvier in: Ann. Sei. nat., 

 ser. 7 V. 15 p. 123 | 1893 G. c. (part.), A. Della Valle in: F. Fl. Neapel, v. 20 p. 570 t. 31 

 f. 20-33; t. 58 f. 80 | 1887 G. c. + G. laevis, Chevreux in: Bull. Soc. zool. France, v. 12 

 p.303 f. 1,2; p.328. 



Peraeon dorsally rounded, pleon somewhat compressed, with strongly 

 marked dorsal division between segments 3 and 4, segments 5 and 6 completely 

 fused, but with a dorsal depression between two humps which, like segment 4, 

 are serrate; telson attached to the lower margin of the steeply truncate 

 back of the Compound segment. Head, lateral corners obtusely produced. 

 Side-plates 1 — 4 not very large, successively larger, lower margin rounded, 

 narrow, subserrate, ö^^^ large, the bind lobe deeper than side-plate 4 ; side-plate 7 



