57 



the Misophriidce. I think, however, that at any rate some of these forms ought to 

 be regarded as types of particular families. 4 such families are here established, 

 each as yet containing only a very limited number of genera. It is however very 

 probable that the number of genera will be considerably increased in the future; 

 for, owing to the peculiar habits of these Calanoids, our knowledge of the existing 

 forms is certainly still very imperfect. They all agree in being pronounced bottom- 

 forms, and cannot of course be captured in the ordinary tow-net, but only by the 

 aid of the dredge or by some other implements with which the very bottom is 

 swept. As they are of a very small size, moreover, it will be easily understood, 

 that they may to a great extent have escaped the attention of Carcinologists. 

 Indeed, our knowledge regarding these peculiar Calanoids we owe almost exclusively 

 to Th. Scott, who has succeeded in discovering many interesting deep-water Copepods 

 by subjecting the trawl-refuse of fishermen to a minute microscopical examination. 

 From other countries, we only know one solitary form referable to this section, viz. 

 the peculiar Calanoid first described by Dr. Giesbrecht as Moebianus gyrans, a 

 form which was only observed in the aquaria of the Zoological Station in Naples, 

 having probably been transferred to them quite accidentally with the various 

 bottom-organisms (Hydroids or Corals) growing in them. I myself, by the aid 

 of a very light dredge, long ago procured several forms belonging to this sect n 

 at different parts of the Norwegian coast. These will be described below. On the 

 other hand, 1 have not felt justified in including in the Norwegian fauna any of 

 the additional species observed off the Scottish coast, by Th. Scott, on account of 

 the non-pelagic character of those Calanoids. 



Fam. 9. Diaixidae. 



Characters. General habitus recalling that in the Scoleeithricidce. Ce- 

 phalosome united with the 1st pedigerous segment, front produced below to an 

 undivided rostrum. Last segment of metasome distinctly defined from the pre- 

 ceding one. Urosome comparatively small, in female composed of 4, in male of 

 5 segments; caudal rami short, each with 4 subequal apical setse. Eye distinct, 

 double. Anterior antennae scarcely differing in the two sexes, comparatively 

 slender, with the last 2 articulations well defined. Posterior antennae with the 

 inner ramus unusually small. Oral parts on the whole resembling in structure 

 those in the Scokcithricidce, the terminal appendages of the anterior maxillipeds 



9 Crustacea. 



