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that Giesbrecht was right in identifying it with the species previously recorded 

 by Dana as Harpacticus acutifrons. It is an easily recognisable form, dif- 

 fering also markedly in habits from most other Harpacticoida, being a true 

 pelagic animal. 



Occurrence. Some specimens of this widely distributed Copepod were 

 found in a plankton-sample taken in the Skaggerak, about midways between 

 the Norwegian coast and Skagen, and this occurrence may justify the reception 

 of the present form within the Fauna of Norway. 



Distribution. North Sea (at Helgoland), Atlantic Ocean, Mediter- 

 ranean, Indian Ocean. 



Fam. Clytemnestridae. 



Remarks. This family has recently been established by A. Scott, to 

 include the genus Clyneninestra of Dana, which indeed in several points differs 

 so markedly from the other Harpacticoida, that it scarcely can find its place 

 in any of the other families of that division. No other genus referable to this 

 family is as yet known. 



Gen. Clytemnestra, Dana, 1852. 



Syn : Goniopelte, Glaus. 

 Goniopsyllus, Brady. 



Generic Characters. Body more or less slender, tapering distally, with 

 the anterior division conspicuously depressed, its segments, except the last one, 

 being lamellarly expanded and projecting laterally to prominent triangular 

 lappets. Cephalic segment very large, clypeiform, and produced in front to a 

 well defined rostral prominence. Urosome much narrower than the anterior 

 division, and sub-cylindrical in form. Caudal rami comparatively short, with 

 the apical setae much reduced in size. Anterior antennae slender and attenuated, 

 composed of 7 or 8 joints; those in male imperfectly hinged. Posterior 

 antennae with the outer ramus replaced by one or 2 setae. Mandibles very 

 small, with the masticatory part narrowly exserted and the palp obsolete. 

 Maxillae much reduced. Anterior maxillipeds with only a single setiferous lobe 

 inside the basal part Posterior maxillipeds very slender, with the basal part 



