SCALES 

 0.5 mm., 



FIGS. 16-17 

 FIGS. 4-5,19-20 

 FIGS. 1-3 

 FIGS. 18,21-23 

 FIGS. 6-8,14,24 



FIG. 9 



FIGS. 10-13,15 



Plate 4. Figs. 1-3, Eucalanus hungii. Female: fig. 

 1, mandibular palp (E. hungii biuigii) ; fig. 2, first 

 leg {E. hungii hungii) ; fig. 3, mandibular palp (E. 

 hungii calif ornicus). Pigs. 4-9, Calocalanus tenuis. Fe- 

 male: fig. 4, habitus, dorsal view; fig. 5, habitus, lat- 

 eral view; fig. 6, first leg; fig. 7, second pair of legs; 

 fig. 8, third leg; fig. 9, fifth pair of legs. Figs. 10-13, 

 Clansocalamis arcuicornis. Female: fig. 10, fifth pair 

 of legs, large form; fig. 11, fifth pair of legs, small 



form; figs. 12-13, abnormal fifth pairs of legs. Figs. 

 14-1.5, Clausocalanus pergens. Female: fig. 14, uro- 

 some, dorsal view; fig. 15, fifth pair of legs. Figs. 

 16-24, Aetideus pacificus. Female: fig. 16, habitus, 

 dorsal view; fig. 17, habitus, lateral view; fig. 18, ros- 

 trum; fig. 19, posterior part of metasome and uro- 

 some, dorsal view; fig. 20, idem, lateral view; fig. 21, 

 urosome, ventral view; fig. 22, antenna; fig. 23, man- 

 dible; fig. 24, cutting edge of mandibular blade. 



CALANOID COPEPODS FROM NORTH PACIFIC 



539 



