12 



Body in both sexes of a whitish grey colour, with a faint yellow tinge. 



Length of adult female 0.43 0.57 mm. 



Remarks. This form was rather imperfectly described by Glaus from 

 Mediterranean specimens, and has subsequently been observed by other authors 

 in different places of the northern Ocean. The form recorded by Boeck as C. 

 norvegica can scarcely be regarded as specifically distinct, though it represents 

 a strictly littoral variety, with the caudal rami comparatively shorter than in the 

 typical form. Dr. Giesbrecht has also called attention to the variation in this 

 respect both in the present and next species. The Cyclops salinus of Brady is 

 unquestionably the present species, and belongs to its variety norvegica, Boeck. 

 The specific name gracilis proposed by Glaus for the present species, is some- 

 what inappropriate, since in reality this species is of less slender form of body 

 than most of the other known species. 



Occurrence. I have taken this form in several places on the Norwegian 

 coast, from the Christiania Fjord at least up to the Trondhjem Fjord. It is a 

 strictly littoral form, being found close to the shore among algse and scarcely 

 ever, like the next species, at any considerable depth. The variety norvegica 

 occurs rather frequently in shallow creeks and in pools left by the tide, both on 

 the southern and western coasts. 



Distribution. British Isles (Brady), coast of France (Canu), bay of Kiel 

 (Giesbrecht), Franz Josef Land (Scott), Polar Islands north of Grinnel Land 

 (2nd Frain Expedition), Mediterranean (Glaus), Black Sea (Czerniawsky). 



4. Cyclopina longieornis, Boeck. 



(PI. v). 



Cyclopina longicornis, Boeck, Nj'e Slsegter og Arter af Saltvandscopepoder. Clir. Vid. Selsk. 



Forhandl. 1872, p. 41. 

 Syn: Cyclopina littoralis, Brady. 



Specific Characters. female. Body comparatively more slender than in 

 the preceding species, with the anterior division oblong oval in form, greatest 

 width about equalling half the length and occurring in the middle, cephalic segment 

 gradually tapered anteriorly, with the front narrowly rounded. Tail very slender, 

 almost equalling in length the anterior division, genital segment sligthly dilated in 

 front and shorter than the 3 succeeding segments combined. Caudal rami long 

 and narrow, being generally longer than the 2 preceding segments combined, 

 seta of outer edge rather slender and attached a little in front of the middle; 

 apical setse very unequal, the inner medial one equal to the whole tail in length 

 and fully twice as long as the outer, seta of outer corner scarcely half as long 



