BIOLOGICAL BULLETIN 



OF THE 



Marine BtolOQical laboratory 



WOODS HOLE, MASS. 



VOL. LI AUGUST, 1926 No. 2 



CONTENTS 



CASTLE, EDWARD S. Observations on Motility in Certain Cyann- 



phycece 69 



HARMAN, MARY T., 



AND ROOT, FRANK P. Number and Behavior of the Chromosomes in 



Cama cobaya (the Common Guinea Pig) . . 73 



HARVEY, E. NEWTOX. On the Inhibition of Animal Luminescence by 



Light 85 



HARVEY, E. NEWTON. Oxygen and Luminescence, with a Description 



of Methods for Removing Oxygen from Cells 

 and Fluids 89 



ESSENBERG, J. M. Complete Sex-Reversal in the Viviparous Tele- 



ost Xiphophorus helleri 98 



MOORE, CARL R. Scrotal Replacement of Experimental Cryptor- 



chid Testes and the Recovery of Spermato- 

 gcnctic Function (Guinea Pig) 112 



LAWRENCE, WALTER. The Fate of the Germinal Epithelium of Ex- 

 perimental Cryptorchid Testes of Guinea 

 Pigs 129 



PUBLISHED MONTHLY BY THE 



MARINE BIOLOGICAL LABORATORY 



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Entered October 10, 1902. at Lancaster, Pa., as second-class matter under Act of Congress of July 16, 1894 



