212 



outer ramus short, uniarticulate, dilated distally, and carrying 3 strong setae. 

 Mandibular palp biarticulate, with the basal joint slightly dilated. Maxillae with 

 the exopodal and epipodal lobules well defined, accessory lobe wanting. Maxilli- 

 peds of the usual structure. 1st pair of legs rather strongly built and distinctly 

 prehensile, inner ramus 3-articulate, with the outer 2 joints more or less bent 

 upon the 1st. Natatory legs rather fully developed, with the inner ramus in all 

 of them distinctly 3-articulate. None of these legs transformed in male. Last 

 pair of legs with the distal joint comparatively large, inner expansion of proximal 

 joint less produced than in the gen. Mesochra. 



Remarks. This genus was rather imperfectly characterised by Boeck, and 

 indeed was not accepted by any of the British authors. Dr. Giesbrecht, however, 

 supported the Boeckian genus, though confounding it partly with another genus 

 established by Boeck, viz., Ameira. None of the 2 species originally recorded by 

 Boeck as members of the present genus were recognized by subsequent authors. 

 The genus is w r ell characterised from any of the 4 preceding ones by the distinctly 

 3-articulate inner rami of the natatory legs, as also by some other structural 

 differences mentioned in the above diagnosis. We know at least of 4 distinct 

 species referable to this genus, 2 of which belong to the fauna of Norway. 



134. Nitocra typica, Boeck. 



(PI. CXXXVIII). 



Nitocra typica, Boeck, Oversigt over de ved Norges Kyster iagttagne Copepoder. Chr. Vid. Selsk. 



Forh. 1864, p. 274. 



Syn: Canthocamptus palustris, Brady. 

 Nitocra oligochceta, Giesbrecht. 

 Ameira amphibia, Brady. 



Specific Characters. Female. Body very slender, sublinear in form, with 

 the anterior division scarcely broader than the posterior. Cephalic segment not 

 attaining the length of the 3 succeeding segments combined, rostral projection 

 extremely small. Urosome very slightly tapered behind, last segment shorter than 

 the preceding one and coarsely spinulose at the end both dorsally and ventrally; 

 anal opercle fringed with about 12 coarse denticles. Caudal rami much broader 

 than they are long and somewhat obliquely truncated at the end, apical setae 

 rather slender. Anterior antennae almost as long as the cephalic segment and 

 gradually attenuated distally, 3rd joint a little longer than 4th, terminal part not 

 fully attaining _the length of the proximal one. 1st pair of legs with the outer 

 ramus much shorter than the inner, middle joint with a short seta inside, last 



