146 



Posterior antennae with the outer ramus considerably longer than the inner, and 

 composed of 5 joints only, last joint rather narrow, with only 2 apical setse. Last 

 pair of legs with the outer ramus very narrow and slightly curved, being pro- 

 duced at the end inside to a spiniform projection, tip armed with a slender spine, 

 outer edge with 2 much smaller spines, the distal one placed near the tip; inner 

 ramus about half the length of the outer, and produced at the tip to 2 short 

 digitiform projections. 



Male much more slender than female, with the right corner of last seg- 

 ment of metasome remarkably expanded and conically produced behind. Uro- 

 some very slender and somewhat asymmetrical, being generally turned out of 

 the axis of the body to the left, 3rd and 4th segments each produced on 

 right side to a small dentiform process. Right anterior antenna longer than left 

 and much more strongly built, middle section moderately tumefied in its proximal 

 part, its penultimate joint produced at the end anteriorly to a short dentiform 

 projection, last joint with a serrated lamella in front; terminal section exserted 

 at the tip to a strong mucronirorm projection, at the base of which, posteriorly, 

 issue the apical bristles. Last pair of legs rather asymmetrical, the right one 

 being the larger, with the 1st joint considerably dilated, and produced inside to 

 a narrow digitiform process; 2nd joint of both legs with a short dentiform pro- 

 jection inside; terminal joint of right leg somewhat lozenge-shaped, being suddenly 

 dilated near the base, and exserted at the end to a slender acuminate lappet 

 pointing straight downwards, that of left leg broadly oval in outline and partly 

 ciliated on the edges, apical lappet quite short and pointing inwards, outer edge 

 with 2 dentiform projections. 



Colour. Body of female generally pellucid, with a faint yellowish tinge, 

 and exhibiting dorsally at the end of each of the pedigerous segments an inter- 

 rupted transverse band of a dark reddish hue; in some cases, however, rather 

 deeply tinged with a reddish brown pigment, both on the anterior and posterior 

 divisions. Body of male always of a uniform yellowish hue. 



Length of adult female 1.55 mm., of male 1.35 mm. 



Remarks. This form was described by Lubbock as early as the year 1857, 

 and was at that time referred to the genus Potitr/fina of Dana, apparently owing 

 to a slight resemblance in the general form of the body. It is, however, in 

 reality very different from that genus, and is also easily recognizable from any 

 of the other known Calanoida. 



Occurrence. I have met with this Calanoid occasionally in 3 different 

 localities of the west coast of Norway, viz., Molde, Christiansund and Kalvaag. 

 In all these localities it occurred close to the shore, at a depth of a few fathoms, 



