38 



Remarks. This genus was established in the year 1852 by Philippi, to 

 comprise the Mediterranean form recorded by Prestandrea as Cyclops marinns. 

 Subsequently several additional species have been described, some of which, 

 however, have justly been removed by. Dr. Giesbrecht, and referred to particular 

 genera of the family jEtideidce. A considerable number of species are still left, 

 amounting to about 16 in all. To the Norwegian fauna belong 3 species, to be 

 described below, all of which are remarkable from their large size, representing 

 in fact the largest known Calanoids. 



15. Euchaeta norvegiea, Boeck. 



(PL XXIV, XXV, XXVI). 



Eiichceta norvegiea, Boeck. Nye Slsegter og Arter af Saltvandscopepoder. Chr. Viol. Selsk. 



Porli. 1872, p. 40. 



Syn: Enchceta Prestandrea', Boeck (not Philippi). 

 carinata, Moebius. 



Specific Characters. Female. Form of body rather slender. Anterior 

 division, seen dorsally, oblong fusiform in outline, greatest width about equalling 

 l /s of the length, anterior extremity considerably more narrowed than the posterior. 

 Cephalosome faintly defined from the 1st pedigerous segment, rostral ledge but 

 slightly prominent. Lateral lobes of last segment of metasome somewhat produced 

 and narrowly rounded, exhibiting at the tip a small nodiform projection. Urosome 

 unusually slender, exceeding half the length of the anterior division, genital seg- 

 ment with the proximal part rather narrow, carrying 2 small juxtaposed tubercles 

 below, genital protuberance very large and thick, proceeding from the hind part of 

 the segment, and at right angles to it, tip blunted and exhibiting on each side a small 

 projecting lobule. The 2 middle caudal segments of about equal size and minutely 

 hairy. Caudal rami about the length of the last caudal segment, and obliquely 

 oval in form, inner corner drawn out to a conical process carrying the appen- 

 dicular bristle ; the latter exceedingly slender, almost attaining the length of the 

 whole body, and distinctly geniculate at the base; marginal setse very densely 

 plumous, the innermost but one considerably longer than the others, which are 

 nearly equal in length. Anterior antennae slightly exceeding in length the anterior 

 division of the body, the proximal articulations finely hairy on the posterior edge. 



Male exceedingly slender in form, with the cephalon and 1st pedigerous 

 segment wholly coalesced, rostrum deflexed. Urosome narrow cylindric in form, 

 and, as usual, 5-articulate, last segment, however, almost obsolete, hind edge of 

 the 2 middle segments divided into delicate flattened denticles. Caudal rami more 

 rounded than in female, and movably articulated to the last segment, appendicular 



