1 1 III 



1'o-terior ;int'iiii:i i comparatively -lender, .'{-articulate, with the outer ramus short, 

 Inarticulate. Mandibles, maxilla- and anterior maxillipeds resembling in structure 

 those part- ii: /</'/<///.-/>. 1'o-terior maxilliped-. ho\\e\vr. much more slender, and 

 having a very movable articulation between tin- tirst '2 joint-, last juint carrying 

 an elongated daw accompanied liy ~1 or .'! -lender seta'. Kiist pair of legs with 

 the outer ramii- about as in /<///"/<>/>. inner ramus. however, only composed of '1 

 join!- \er\ niovahlx articulated together, the lust one carrying outside 3 short 

 -eta' and at the tip 2 very slender claws. Natatory legs with the ranii rather 

 -lender and -uheipial in length, middle joint of inner ramus carrying in the 2 

 anterior pair- ~1 seta', in the posterior pair 1. Last pair of legs slender and. as 

 in /'///"//*/> . extended laterally. 



Remarks. -This uenus is nearly allied to Jtli/<iji*is, but differs in sonic 

 particular-, e-pedally as regards the structure of the posterior maxillipeds and 

 that of the 1st pair of legs. Of this genus also. ~2 well-defined species have been 

 found off the Norwegian coast. 



''>. Idyella pallidula, (^. <>. Sars. n. p. 



(PI. I.VIII, Ii-. 1 ). 



s/nfir Characters. Female. Anterior division of body rather broad and 



d-pri'--ed : seen dor-ally, oval fusiform in outline, with the greatest width some- 

 what hchind the middle. Cephalic segment very large, about twice as long as 

 the :; -m-cerdiiig -egments cnmbined. and gradually tapering anteriorly, front 

 conically produced. Kpimeral plates Bub-COntigUOUS, obtuse at the ti}is. Last 

 -lament of meta-ome very small. t'rosome not attaining half the length of the 

 anterior dhision. genital segment produced on each side, somewhat in front of 

 the middle, to an ol>lii|iiel\ posteriorly-pointing triangular lobe; Jnd segment 

 -imple. Caudal rami short, with the usual number of -eta', one of them issuing 

 from the middle of the outer edge, the L' middle apical seta' rather slender. Kye 

 wholly ab-ent. Anterior antenna' scarcely attaining half the length of the cephalic 

 -euim-nt and clothed with comparatively short Bet, L'nd joint the largest, terminal 

 part about the length of the '2 preceding joint- combined. Posterior maxillipeds 

 uith the midille joint xcai-cely at all dilated, siiblinear in form. First pair of 

 legs with the outer ramus much curved and somewhat exceeding half the length 

 of the inner, proximal joint of the latter rather broad, lamellar, with a strong 

 pliimo-.' seta in the middle of the inner cd.ue. distal joint much narrower than 

 the proximal one, and more than half its length. Last pair of h -- \er\ narrou. 



