101 



narrow, with the outermost seta more or less remote from the apex Anterior 

 antennae slender, resembling in structure those in the genus Ascomyzon, though 

 having the proximal and distal portions less sharply marked off from each other; 

 those in male distinctly hinged. Posterior antennae of normal structure. Oral 

 cone not much prolonged, pyriform in shape. Mandibles with the masticatory 

 part moderately slender; palp small, uniarticulate. Maxillae with the outer lobe 

 much narrower than the inner, and tipped with only a single seta. Maxillipeds 

 comparatively slender; claw of the anterior ones distinctly biarticulate. Natatory 

 legs with the rami rather narrow ; their armature about as in Dermatomyzon. 

 Last pair of legs with the distal joint more or less prolonged. 



Remarks. This genus was established in the year 1893 by (.'ami. to 

 include the species recorded by Brady as Cijclopim-a gracilicauda. Another 

 nearly-allied species has been described by Giesbrecht from the Gulf of Naples 

 tinder the name of C. Canui and a 3rd species, C. eleyans, has been added by 

 A. Scott. The last-named species differs however in some points so much from 

 the other two, that I have felt justified in removing it to a separate genus To 

 the Fauna of Norway only belongs the type species, to be decribed below. 



59. Collocheres graeilicauda, (Brady). 



(I'l. LXIII). 



Ci/plopicent gracilicauda, Brady, Monogr. British < 'opepuda, Vol. Ill, p. 58. I'l. LXXXITI. 



fis. 110. 



Syn : .\*<-i>iiu/:o/i niiiii'ifiilcp. 

 Clai<Konn/.:<i>t gracilicauda, (iiesbr. 



Specific Characters. Female. Anterior division of body, viewed dorsally, 

 regularly oblong oval in outline, with the greatest width about equalling half the 

 length. Cephalic segment large and very deep, the epimeral edges being angu- 

 larly curved in the middle; rostrum not very large, but distinctly prominent below, 

 and acutely pointed. Last trunk-segment very small, scarcely broader than the 

 genital segment. Tail slender and elongated, being not much shorter than the 

 anterior division; genital segment large and somewhat dilated in the middle; the 

 3 succeeding segments gradually diminishing in size. Caudal rami exceedingly 

 long and narrow, almost attaining half the length of the tail, and slightly divergent, 

 both edges smooth; outermost apical seta short, spiniform, and, together with 

 the dorsal bristle, somewhat remote from the apex, which projects outside to a 

 short dentiform process; inner mediate seta scarcely exceeding in length the 

 corresponding ramus. Anterior antennae almost as long as the cephalic segment, 



