Fig. 19. Various planktonic criistacca etc. 

 I, Podon IcHckarti 2, Evadne nordmaniii. 3, Comhoecia elegaiis. 4, Halobalcs wicaiis. 5, Thcmisto 

 ahyssormii. 6, Hyperia <ialha male (the female is much broader). 7, Eurydia' ptikhra. S, Idothea 



haUhica. 9, Caligus rapax male. 10, Diastylis rathkci. 



[i and 2, cladocerans; 3, ostracod; 4, insect; 5 and 6, amphipods; 7 and cS isopods; 9, sea louse; 



a semi-parasitic copepod; 10, cinnacean.] 



