— lO — 



Famille GALANIDiE 

 I. Calanus plumchrus, sp. nov. 



(Plate I, figs, i-g) 



Female. — Head defined from each other. Frontal part of 

 the head and lateral corners of the last thoraxsegments rounded. 

 Anterior antennae long and slender, reaching to the end of 

 body and calculating 25 articulations, though the ist. and 2nd., 

 the 8th. and 9th. coalesced with one another, supplied anteriorly 

 with comparatively short and uniform bristles ; penultimate 

 and antepenultimate articulations with unusually strong and 

 densely plumose setae behind. The terminal end of 2nd. joint 

 of basalpodite of 2nd. to 4th. pairs of legs spinally protruding, 

 ist. basal joint of last pair of legs neither denticulating nor 

 exhibiting any plumose setae along the inner ledge ; each 

 of endo - and exo - podite articulated. Abdomen consisting 

 of 4 segments and caudal rami or furca with strong and 

 very slender inner setae ;' carrying along its axis horizon- 

 tally and vertically fine numerous plumose, the horizontal 

 thicker than the other. Length of the body 4.2 — 5.2 mm. 

 Colour whitish pellucid ; the plumose setae of anterior 

 antennae and caudal rami bright red, often tinged with orange 

 brown. 



• Male. — Were not met with. 



Notes. — This is at first glance like C. finmarchicus. It is, 

 however, on a closer examination, distinguished from that 

 species by the stucture of inner ledge of i st. joint of basalpodite 

 of 5th. pair of legs and 2nd. inner setae of caudal rami. The 

 present form is especially formed in cold water, occuring 

 abundantly in almost all specimens of plankton taken in 

 Ochotsk sea and in some places from Nemuro to cape Inuboye. 



Loc. — North Pacific ; 87«, 10' N., 143°, 10' E. ; 40^,47' N., 

 142^30^ E. ; 42^,55^ N., 145°, 3o' E. ; 46^,04' N., i54°,io' E. 



Ochotsk sea ; 45°, 12^ N., 144°, 21' E. ; 45^27' N., 144^23' E. ; 

 47",2o^N,, I48^28^E. ; 47^58' N., 148^40^ E. ; 5o^o5' N., 



