Fig. 20. Copepods. 

 I, Pseudocalanus cloiiqatiis. 2, Centropages typiais. 3, Acartia loiigircinis. 4, Tcmora lotigitcrnis. 

 $, Eurytemora hirundoidcs. 6, Calamis Jinntnrchicus. 'j,Metridia Iticciis. .S. C^cuidaaa annata. y, Parcn- 



chaeta norvcgica. 10, Aiiomaloara patersoni , male. 11, tcmalc. 

 [The arrow in i indicates the joint between the cephalosonie and abdomen, see text p. 65.] 



