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PACIFIC SCIENCE, Vol. XIV, April I960 
phose, and build tubes during the 13- to 17- 
segment stage. 
The adult characteristics are considered in 
Woodwick (1953). 
ACKNOWLEDGMENTS 
The writer is indebted to the Biology Depart- 
ment of the University of Southern California 
and to the Allan Hancock Foundation for re- 
search space and equipment and to Dr. Olga 
Hartman, Dr. John L. Mohr, and Dr. Donald J. 
Reish for invaluable assistance. 
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