208 



than the outer and more or les- bent at tin- end. Natatory legs with the inner 

 ranius biarticulate, but comparatively more fully developed than in AHhci/i'lIu; 

 that of 3rd pair slightly transformed in the male. Last pair of legs with the 

 distal joint very small, inner expansion of proximal joint in female much pro- 

 duced, linguit'orm. 



//// '//!>. This genus also is very nearly allied to Canthocamptus, and has 

 partly been confounded with it by other authors. It differs, however, in the 

 reduced number of articulations in the anterior antenna-, and in the more pro- 

 nounced prehensile character of the 1st pair of legs, as also in the inner ramus 

 of the natatory legs being biarticulate. with the proximal joint well developed. 

 Several species of this genus have been described by different authors, partly 

 from the sea, partly from brackish water. None of them are, however, strictly 

 fresh-water forms, as is the case with the species belonging to the 3 preceding 

 genera. To the fauna of Norway belong 3 species, to be described below. 



131. Mesoehra Lilljeborgi, Boeck. 

 (PJ. ex xxv). 



a Lilljeborgi, Boeck, Oversigt over de ved Norges Kyster iagttagne Copepoder. chr. Viil. 



Selsk. Forli. 1864, p. 275. 



Syn : Canthocamptus Stn'hni, Lilljeborg (not Baird). 

 Paratachidius gracilis, Brady & Robertson. 



( 'h >-rl<T$. Female. Body moderately slender and gradually 

 attenuated behind, with the cephalic segment about as long as the 3 succeeding 

 segments combined. Eostral projection distinctly prominent, obtuse at the tip. 

 1'rosome much shorter than the anterior division and having the segments minutely 

 spinulose at the hind edge ventrally and laterally; last segment about the length 

 of the preceding one. Caudal rami scarcely longer than they are broad, apical 

 setae of moderate length. Anterior antenna- much shorter than the cephalic seg- 

 ment. 7-articnlate, terminal part, ''-articulate and shorter than the proximal one. 

 1st pair of legs with the outer ramus shorter than the 1st joint of the inner, 

 middle joint with a small seta inside; inner ramus biarticulate, the 2 outer joints 

 being coalescent and scarcely exceeding in length ' ; of the 1st joint, seta inside 

 the latter joint attached considerably behind the middle. Last pair of legs with 

 the distal joint rounded oval in form, inner expansion of proximal joint much 

 produced, linguiform with 6 slender marginal seta-. 



M'llf with the inner ramus of .'inl pair of legs biarticulate, last joint 

 armed inside with a de)|e\ed spine and at the tip with 2 unequal seta}. Last 



