Explanation of the Plate, 



H. n. = heterochaeta norvegica. 



C. h. = calanus lyperboreus. 



C. f. = finmarchicus. 



M. h. = metridia hibernica. 



yi. y2. ya = joints of the outer branch of feet, 

 ii, i2, is = ,. inner 

 bi, b2 = basal joints of feet and maxillipeds. 



H. n., y3, foot of 4th pair, female 10 % 



foot of 5th pair, right side, male , . 100 /i 



mandible of female 60 /i 



y3, foot of 5th pair, left side, male 100 /i 



the cutting edge of the mandible (mandibel- 



lade), female 100 /i 



the inner branch of posterior antenna, female I0 % 



M. h., abdomen of female, dorsal view 6 % 



the last joint of cephalothorax, female, la- 

 teral view 10 % 



C. f., the dentition curve on the basal joint of the 



foot of 5th pair, female 10 % 



C. h., the dention on the basal joint of the foot of 



5th pair, female 



foot of 5th pair, right side, male 



the dentition curve on the basal joint of the 



left foot of 5th pair, male 60 /i 



foot of 5th pair, left side, male 



H. n.. foot of 5th pair, right side, male 



6 % 

 8 % 



'/i 



