SCALES 



Plate 1. — Figs. 1-2, Calanus glacialis. Female: fig. 

 1, urosome, dorsal view; fig. 2, inner margins of coxae 

 of fifth pair of legs. Figs. 3-4, Calanus pacificus. Fe- 

 male: fig. 3, urosome, dorsal view; fig. 4, inner mar- 

 gins of coxae of fifth pair of legs. Figs. 5-7, 

 Neocalanus gracilis. Male: fig. 5, habitus, dorsal view; 

 figs. 6-7, endopods of left fifth legs. Figs. 8-10, Neo- 

 calanus robustior. Male: fig. 8, habitus, dorsal view; 



fig. 9, left fifth leg; fig. 10, endopod of left fifth leg. 

 Figs. 11-15, Eucalanus attenuatus, small form. Fe- 

 male: fig. 11, habitus, dorsal view; fig. 12, forehead, 

 dorsal view; fig. 13, urosome, dorsal view; fig. 14, 

 genital segment, ventral view; fig. 15, mandibular 

 palp. Figs. 16-17, Eucalanus attenuatus, large form. 

 Female: fig. 16, habitus, dorsal view; fig. 17, habitus, 

 lateral view. 



CALANOID COPEPODS FROM NORTH PACIFIC 



531 



