Explanation of the Plate. 



H. 11. = heterocliajta norvegica. 



C. li. = calanus liyperboreus. 



C. f. = — fiiimarchicus. 



M. h. = meti-idia liiberiiica. 

 yi, y2, y3 = joints of the outer branch of feet, 

 ii, i2, is = — ,. — inner — ,. — 

 bi, b2 = basal joints of feet and ma.'iiliiped.s. 



Fig. 



1. 



2. 



3. 



4. 



5. 



6. 



7. 



8. 



9. 

 10. 

 11. 

 12. 

 13. 

 14. 

 15. 

 16. 



17. 

 18. 



H. n. 



proximal joints of anterior antenna, male. 



yl, y2, foot of fifth pair, female ^°°/i 



foot of fifth [)air, female 107, 



maxilla, female loo/j 



ceplialothorax and abdomen, male, 

 distal joints of anterior antenna, male. 



maxillijied of 1st pair, female "^^i 



foot of 2d pair, female ''"/j 



maxilliped of 2d pair, male ""/i 



posterior antenna of female "^i 



abdomen of female. 



foot of 3d pair, male. 



7i 



C. f., 



foot of otli pair, left side, male '"'/i 



maxilliped of 2d pair, female ^°°/i 



foot of .5th pair, left side, male ^'^Vi 



the dentition curve on the basal joint of the 



same 



foot of 5th pair, right side, male 



100/^ 

 "'7. 



C. li., uephalothorax and abdomen, male, lateral view 



1: 



/i 



Fig 



19 



?? 



20 



!5 



21 



)) 



22 



?' 



23 



J! 



24. 



)? 



25. 



51 



26. 



27. 



28. 



29. 

 30. 



31. 

 32. 



H. n., j3, foot of 4th pair, female loo/i 



— foot of 5th pair, right side, male ^°°/j 



— mandible of female so/j 



— y3, foot of 5th pair, left side, male "O/i 



— the cutting edge of the mandible (mandibel- 

 lade), female loo/j 



— the inner branch of posterior antenna, female "'7i 

 M. h., abdomen of female, dorsal view '"'"/j 



— the last joint of cephalothorax, female, la- 

 teral view 100/^ 



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



foot of 5th pair, female 1"% 



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



5th pair, female ''O/j 



— foot of 5th pair, right side, male "o/i 



— the dentition curve on the basal joint of the 



left foot of 5th pair, male <«'/, 



— foot of 5th pair, left side, male "o/i 



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



