44 



Remarks.- This genus was established in the year 1873 by Messrs. Brady 

 & K'..bertson to comprise a small Harpacticoid, M. utlnntim B. & R., taken by 

 them in the open sea by the aid of the surface-net. The genus was subsequently 

 withdrawn by Prof. Brady, who in his Monograph described it as Kcthitixtmiii 

 .itl,intin<m. believing that the anatomical differences were not sufficient to remove 

 it from that genus. I'r. (ii.-sbrecht has, however, again restored the original 

 genus, adding another nearly-related form. M. ro*-a (Dana). I am also myself 

 of ..pinion that the genus M',,-r<i*<'trlln ought to be maintained, differing, as it does, 

 fmiii />/, '. not only in the peculiar habits of the species, but also in some 



anatomical details mentioned in the above diagnosis. Of the 2 hitherto known 

 species, only one belongs to the fauna of Norway. 



29. Mierosetella norvegica (Boeck). 



(PI. XXIV). 



,><>i-i-i't/i<-fi. Hot-ek. Ovf>rsit over de ved Norges Kyster iagttagne Copepoder. Chr. Vid. 



Selsk. Forh. 1864, p. 281. 



SVM: Ectinosoma attanticum, Brady. 



Specific Characters Female. Body extremely slender, nearly linear in 

 tiirm. the greatest width scarcely exceeding '/H of the length. Cephalic segment 



* 



only very -lightly vaulted above, seen dorsally, gradually contracted in front, 

 rostrum short and abruptly deHexed. Urosome about half the length of the an- 

 ti-iior division of the body, segments clothed with several circlets of delicate 

 -pinnies. Caudal ranii scarcely longer than they are broad, apical setae more or 

 less divergent, the innermost but one about twice the length of the urosome. 

 \nterior antennae exceeding half the length of the cephalic segment, and composed 

 of 'i articulations, terminal part fully as long as the proximal one. Last pair of 

 legs \\ith the distal joint scarcely as long as the proximal one, and rounded in 

 form, innermost apical spine very small, the other 2 considerably elongated, 

 setiform. appendicular bristle normal; inner expansion of proximal joint large, 

 extending as far as the distal joint, inner apical spine much shorter than the outer. 



Mnl<- somewhat smaller than female, and easily recognizable by the geni- 

 culate anterior antenme and the bipartite genital segment. 



Body pellucid, white, with a faint yellowish tinge. 



Length of adult female 0.46 mm., of male 0.38 mm. 



/A ///'///>. - There cannot, in my opinion, be any doubt that the form briefly 

 recorded by Boeck as Nr/ //a nnn-cij'iL-a is this species, and therefore, according 



