19 



Fam. 4. Pseudocalanidae. 



Syn: Clausocalanince, Giesbrecht (part). 



Characters. Cephalosome, at any rate in female, coalesced with the 1st 

 segment of metasome, front unarmed, or provided below with 2 soft tentacular fila- 

 ments, as in Calanus. Last segment of metasome united with the preceding one, 

 lateral corners not produced. Urosome in female 4-articulate, in male 5-articulate 

 and having the anal segment shortened. Caudal rami well defined, with only 4 

 of the marginal seta? developed. Anterior antenna? in female 24-articulate, 8th 

 and 9th articulations being coalesced, in male thickened at the base and clothed 

 with slender, sabre-like sensory appendages, number of articulations reduced. 

 Posterior antennae with the outer ramus always longer than the inner. Oral 

 parts in female normal, in male much reduced. Legs slender, inner ramus of 1st 

 pair uniarticulate, of 2nd pair biarticulate, of 3rd and 4th pairs 3-articulate; 

 terminal joint of outer ramus in 2nd to 4th pairs narrow, with 3 spines outside, 

 apical spine coarsely serrate. Last pair of legs in female small, simple and 3-arti- 

 culate, or wholly wanting; those in male likewise simple, but rather slender, left 

 leg 5-articulate, right more or less styliform. 



Remarks. This family answers to the subfamily Clausocalanince of Dr. 

 Giesbrecht. As, however, the genus Pseudocalanus is of much earlier date than 

 Clausocalanus, the family ought to be named as above. From the Paracalanidce 

 this family chiefly differs in the structure of the legs, partly also in that of the 

 posterior antennae. Dr. Giesbrecht refers to this family the following 6 genera: 

 Clausocalanus Giesbr., Ctenocalanus Gicsbr., Pseudocalanus Boeck, Drepanopus 

 Brady, Spinocalanus Giesbr. and MoeUanus Giesbr. The last-named genus 

 (= Stephos Scott) ought, however, in my opinion to be discarded and transferred 

 to a separate family in the section 1 IsoJcerandria, to be treated of farther on. 

 Of the remaining 5 genera, 2 are represented in the fauna of Norway. 



Gen. 4. PseudOCalanUS, Boeck, 1872. 



Syn: Clausia, Boeck (not Claparede). 

 Lucullus, Giesbrecht. 



Generic Characters. -Body of comparatively slender form, with the cephalo- 

 some and 1st segment of metasome coalesced in both sexes, front rounded and 

 carrying 2 soft tentacular filaments below. Urosome in both sexes very slender, 



