638 PHOTOPERIODISM IN VERTEBRATES 



Annual reproductive cycles in four species of west coast starfishes. /. Exptl. 



Zool, 138 (2). 

 Feder, H. 1956. Natural history studies on the starfish Pisaster ochraceus 



(Brandt, 1835) in the Monterey Bay area. Ph.D. thesis, Stanford University, 



Stanford, Calif. 

 Giese, A. C. 1959. Annual reproductive cycles of marine invertebrates. Ann. 



Rev. Physiol, 21, 547-76. 

 Giese, A. C., L. Greenfield, H. Huang, A. Farmanfarmaian, R. A. Boolootian, 



and R. Lasker, 1959. Organic productivity in the reproductive cycle of the 



purple sea urchin. Biol. Bull, (in press). 

 Korringa, P. 1947. Relations between the moon and periodicity in the breed- 

 ing of marine animals. Ecol. Monographs, 17, 347-81. 

 Lasker, R., and A. C. Giese. 1954. Nutrition of the sea urchin, Strongylo- 



centrotus purpuratus. Biol. Bull., 106, 328-40. 

 Loosanoff, V. L., and H. C. Davis. 1950. Conditioning V. mercenaria for 



spawning in winter and breeding its larvae in the laboratory. Biol. Bull., 98, 



60-65. 

 MacGinitie, G. E., and N. MacGinitie. 1949. Natural History of Marine 



Animals. McGraw-Hill, New York. 

 Rowan, W. 1925. Relation of light to bird migration and developmental changes. 



Nature, 115, 494-95. 

 Swann, E. F. 1953. The Strongylocentrotidae (Echinoidea) of the Northeast 



Pacific. Evolution, 7, 269-73. 

 Thompson, W. F., and J. Thompson. 1919. The spawning of the grunion 



{Eeuristhes tenuis). California Fish and Game Comm., Fish Bull., 3, 1-29. 



