Bull. U. S. B. !•'., 1924. (Doc. 968.) 



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Pin 27— Surface catch illustrating abundance of larval copepods in the "nauplius" stage, in Massachusetl 



' ' Hay in May oration 20121, May 4, 19211). X9 



Fra. 23. T'a ■ -.hi ■, more highly magnified. < about 100 



