80 
PACIFIC SCIENCE, Vol. XVIII, January 1964 
Personal observations on the ontogenic dis- 
tribution of S, gazeilae are shown in Figure 12. 
This agrees with David’s (1955) ontogenic 
distribution of this species. 
Adults as well as young S . scrippsae were 
found in the transition region and in the main 
part of the California Current, while only the 
young were recorded at the outer edges and 
southernmost boundaries of these water masses. 
The structure of the population of S. scrippsae 
shifts with latitude along with the extension of 
the inflow of the respective water mass (Al- 
varino, in press). 
It was observed that only the young of S. 
gazeilae (present data) and S. scrippsae spread 
to the outer edge of their distributional region. 
The young of S. zetesios appeared in the 
northeast Pacific at about 300 m, whereas the 
adults were found only at depths below 500 m. 
In station 46 of the NORPAC CalCOFI ( 38° 
20' N — 127° 05' W) specimens of S. minima 
of a size larger than usual were found from 700 
to 280 m depth. 
Studies of the life history of the species, 
mainly those of particular interest as "indica- 
tors,” will give some understanding of their 
ecological needs, and of their relation to oceano- 
graphic concepts. 
ACKNOWLEDGMENTS 
This work was carried out under the Marine 
Life Research Program, the Scripps Institution of 
Oceanography’s component of the CalCOFI, and 
also was supported in part by a grant from the 
National Science Foundation (NSF G19417). 
I wish to express my grateful appreciation to 
Dr. M. W. Johnson, Dr. E. W. Fager, and Dr. 
Mary Sears for their kind advice and helpful 
suggestions. 
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