Fig. 1 8. Various kinds of zooplankton. 



I Microsetella noruegica; 2, Tiqriopus fulvus; 3, Idya fmcata; 4, Oithona similis; 5, Sagitta eh'snns; 



6, Shell of Clio pyramidata; 7, Shell of Spiratella (= Linwchia) retnversa; R, Shell of SpmUeUa 



helidno; 9, Clione Umacina; 10, Sepiola; 11, Brachioteiithis. 



[The arrow in 4 indicates the joint between the cephalosome and abdomen, see text p. 65.] 



