16 



earlier date in a sample taken by Dr. Hjort in the North Sea, about midway 

 between Scotland and Norway. Though not yet found in the immediate vicinity 

 of the Norwegian coast, this form certainly has a claim to be included in the 

 fauna of Norway. 



Distribution. Western part of the Mediterranean, off Gibraltar, the Pacific 

 from the Magellan strait northwards to Lat. 6 N. (Giesbrecht); Atlantic Ocean 

 from Lat. 6 N. til 48 N (Cleve); ? N. of Scotland (Moebius). 



Fam. 3. Paracalanidae. 



Characters. Body less slender, with the cephalosome not produced in 

 front, and, as a rule, coalesced with the 1st segment of metasome, rostral filaments 

 as in Calanus. The last 2 segments of metasome fused together. Urosome short, 

 in female generally 4-articulate ; caudal rami well defined, with only 4 of the 

 apical setffi distinctly developed. Anterior antennae in female 25-articulate, sub- 

 apical setse not plumose, those in male greatly thickened at the base, with the 

 proximal articulations much reduced in number, and clothed with comparatively 

 short, club-shaped sensory appendages. Posterior antennas with the outer ramus 

 scarcely longer than the inner, and having the terminal joint comparatively short. 

 Oral parts in female normal, in male much reduced. Legs rather slender, inner 

 ramus in 1st pair biarticulate, in the 3 succeeding pairs 3-articulate, and partly 

 spinulose on the hind face, outer ramus in the latter with the terminal joint 

 narrow and armed with only 2 spines outside. Last pair of legs, when present, 

 poorly developed, not natatory, left leg in male longer than right, which is some- 

 times wholly wanting. 



Remarks. In the structure of the several appendages, the forms belonging 

 to this family agree on the whole with those of the Calanidce, differing, however, 

 rather materially in the circumstance of the 5th pair of legs not being natatory 

 in either of the sexes, but very small and simple, or wholly wanting in the female. 

 The adult male has the anterior antennas transformed in a similar manner to 

 that in the Calanidce, but is distinguished by the great reduction of the oral parts, 

 especially the maxillipeds. The family comprises as yet 3 genera, viz., Para- 

 calanus Boeck, Acrocalanus Giesbrecht, and Calocalanus Giesbrecht. Only the 

 first of these genera is represented in the northern oceans. 



