Mr. Lubbock on some Arctic species of Calanidse. 127 



each ramus, and the secondary setje are larger than in the other 

 species. The inner side of the large ramus also in all the legs 

 has on the second segment a row of short hairs resembling the 

 seta? on the longer ones. 



The fifth pair (fig. 5) have the rami 3-jointed. They have 

 small spines on the base like the corresponding pair of legs in 

 C. magnus. 



Colour ? 



C. borealis. Frons rotundatus. Cephalothorax magnus, 6-arti- 

 culatus, postice rotundatus, in medio acutus. Antenna? 

 ahticse corpore paulo longiores, setis longis. Pedes bi- 

 remes antici, ramis 2-articulatis ; postici unum tantum- 

 modo segmentum habent. Abdomen 3-articulatum, stylis 

 brevibus. 



Long. 5 unc. 



Hab. Mare Arct. N. Lat. 76°-78° 40', W. Long. 70°. 



The apical hairs of the anterior antennse are short. The pos- 

 terior antenna? resemble those of C. magnus (PI. V. figs. 2, 3). 

 Colour ? 



C. elegans. Frons rotundatus. Cephalothorax angustus, 6-arti- 

 culatus, postice rotundatus. Antennae anticse corpore paulo 

 longiores, setis longis. Pedes biremes primi ramis 2-ai-ticulatis, 

 ultimi maris unum tantummodo segmentum habent ; fcemina? 

 pedes postici parvissimi. Abdomen 2-articulatum. 



Long. ^ unc. 



Hab. Mare Arct. N. Lat. 62° 11', W, Long. 52°. 



This species appears only to have occurred in one place, where 

 it was abundant. The individuals are all about the same size, 

 and I do not think it can be the young of any other species 

 (PI. V. figs. 7,8,9). 



Colour ? 



C. longus. Frons rotundatus. Cephalothorax 5-articulatus, pos- 

 tice obtusus sed non rotundatus. Antennae anticse corpore bre- 

 viores, setis brevibus, apicalibus tamen longis. Pedes biremes 

 antici ramis 3-articulatis. Pedes postici minimi. Abdomen 

 longum, angustum, 3-articulatum. 



Long. ^ unc. 



Hab. Mare Arct. N. Lat. 76°-76° 30'. 



Of this species there are only three specimens, but it is very 

 distinct from any of the others ; the length of the abdomen being- 

 its most striking characteristic. 



The anterior antenna are about as long as the cephalothorax, 



