20 



with the caudal rami sublinear in form. Anterior antennae shorter than the body, 

 in the male with the 2 proximal articulations coalesced to a large flattened seg- 

 ment, the succeeding 5 articulations well defined. Posterior antennae with the 

 outer ramus 7-articulate, terminal joint rather large. Inner ramus of 2nd to 4th 

 pairs of legs without any spinules on the hind face. Last pair of legs wholly 

 wanting in female, those in male very slender, right leg styliform and shorter 

 than the left. 



Remarks. This genus, established by Boeck, was first named Clausia in 

 honour of the late Prof. C. Glaus. As however this name had been previously 

 appropriated by Claparede to designate a genus of parasitic Cyclopoida, it was 

 subsequently by the same author changed to Pseudocalanus. Dr. Giesbrecht, on 

 describing the Copepoda from the bay of Kiel, did not at first recognize Boeck's 

 genus, to which the name Lueullus was applied; but in a postscript to his treatise 

 he has admitted the identity of these 2 genera. Besides the well-known form 

 described below, 2 other species have been added by the present author from 

 Nansen's Polar Expedition, viz., P. major and P. pygmceus. The latter, however, 

 I am now inclined to regard as belonging to a new nearly-allied genus, for which 

 the name Microcalanus may be proposed. 



6. Pseudocalanus elongatus, Boeck. 



(PI. X & XI). 



Clausia elongata, Boeck, Oversigt over de ved Norges Kyster iagttagne Copepodei-. 

 Chr. Vid. Selsk. Forh. 1864, p. 234. 

 Syn: Lucullus acuspes, Giesbrecht. 

 Calanus Clausii, Brady. 



Specific Characters. Female. Anterior division of body, seen dorsally, 

 oblong oval in shape, greatest width but slightly exceeding */ s of the length, 

 frontal part but little prominent, and, seen laterally, narrowly rounded; lateral 

 corners of last segment of metasome obtusely rounded. Urosome somewhat 

 exceeding half the length of the anterior division, genital segment considerably 

 larger than any of the others and slightly dilated in front. Caudal rami exceed- 

 ing in length the anal segment, and transversely truncated at the tip, exhibiting 

 a small dentiform projection outside the apical setse. Ovisac present, of irregular 

 rounded form, but easily detached, and containing a very limited number of ova. 

 Anterior antennae, when reflexed, scarcely reaching beyond the 2nd caudal segment, 

 the 2 basal articulations imperfectly separated. Posterior antennae with the outer 

 ramus about l / longer than the inner. 1st pair of legs much smaller than the 

 others, terminal joint with only a single setiform spine outside. 



