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University of California Publications in Zoology [Vol.22 



naupliar stage 3. Segments one and two of the female urosome arc 

 partially fused. The constriction between the two segments is. how- 

 ever, clearly visible. 



Figs. 1-3, camera lucida drawings. Abbreviations: tit., thorax; »., urosome. 

 Fig. 1, front of head. male. X 250. Fit;-. 2. adult female, dorsal aspect, X 125. 

 Fig. 3, Thorax and urosome in part, dorsal aspect: a, eopepodid stage 1, male, 

 X 250; b, eopepodid stage 2, male, X 212; c, eopepodid stage 3, female, X 212; 

 d, adult, male, X 150. 



A minute examination of specimens reveals differences in the 

 segments of the appendages and number of bristles in the various 

 stages, as well as in the more obvious characters of segmentation, 

 and number of appendages. The following key summarizes the 

 general diagnostic characters for the immature stages of this species, 

 which are clearly evident in an enumeration of zooplankton organisms. 



