14 



asymmetrical, caudal setae present in the normal number. Anterior antennae long 

 and slender, with the articulations somewhat reduced in number, and having some 

 of the setae much elongated, those attached behind to the penultimate and ante- 

 penultimate articulations, as in Calanus, densely plumose. Posterior antennae with 

 the inner ramus longer than the outer. Oral parts on the whole normal. Legs 

 comparatively short, especially the 1st pair, the rami of which have the number 

 of joints more or less reduced; terminal joint of outer ramus in 2nd to 4th 

 pairs with 3 spines outside. Last pair of legs, when present, very small, simple, 

 not natatory. 



Remarks. The forms belonging to this family are easily recognizable by 

 their slender, pellucid body the cephalic part of which is generally much pro- 

 duced , by the very long and slender anterior antennae, and the comparatively 

 short urosome. They differ, moreover, very essentially from the Calanidce in the 

 structure of the legs, especially the last pair, which are much reduced, and not 

 natatory in either of the sexes. According to Dr. Giesbrecht, this family com- 

 prises as yet 3 genera, viz., Eucalanus Dana, Rhincalanus Dana, and Mecynoccra 

 Thompson. All the species belonging to these genera are southern in distribution, 

 none of them having hitherto been recorded from northern latitudes. I am, how- 

 ever, now enabled to state the occurrence of at least one species so far north as 

 to admit of being referred to the fauna of Norway. 



Gen. 2. RhinealailUS, Dana, 1852. 



Generic Characters. Cephalosome produced in front to a nose-like pro- 

 jection carrying the rostral filaments below. Last pedigerous segment very small, 

 with the epimeral parts imperfectly developed. Urosome in female 3-articulate, 

 anal segment confluent with the caudal rami, which are only slightly asymmetrical, 

 and carry 2 of the setae outside, middle apical seta on left ramus greatly elon- 

 gated. Anterior antennae much longer than the body, and consisting (in female) 

 of 23 articulations only, the first 2 and the 7th and 8th being fused together. 

 Posterior antenna? with the inner ramus moderately produced, outer ramus 8-arti- 

 culate, with the terminal joint very small. Posterior maxillipeds with the terminal 

 part shorter than either of the basal joints. First pair of legs with both rami 

 biarticulate, outer ramus af the 3 succeeding pairs with the spines of the outer 

 edge not defined from the joints. Last pair of legs (in female) 3-articulate. 



Remarks. This genus is chiefly characterised by the nose-like anterior 

 projection of the head, a character which has, indeed, given rise to the generic 



