Contents of Volume LI 



No. i. JULY, 1926. 



Twenty-Eighth Annual Report of the Marine Biological Lab- 

 oratory i 



No. 2. AUGUST, 1926. 



CASTLE, EDWARD S. Observations on MotUity in Certain 



Cyanophycece 69 



HARMAN, MARY T., AND ROOT, FRANK P. Number and Be- 

 liazior of the Chromosomes in Cavia cobaya (the Com- 

 mon Guinea Pig) 73 



HARVEY, E. NEWTON. On the Inhibition of Animal Lumi- 

 nescence 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 J 7 ii'iparous 



Teleost Xiphophorus helleri 98 



.UooRE, CARL R. Scrotal Replacement of Experimental Cryp- 

 torchid Testes and the Recovery of Spermatogenetic 

 Function (Guinea Pig} 112 



LAWRENCE, WALTER. The Fate of the Germinal Epithelium 



of Experimental Crypt-orchid Testes of Guinea Pigs .... 129 



No. 3. SEPTEMBER, 1926. 



FROBISHER, MARTIN, JR. Observations on the Relationship 

 between a Red Tornla and a Mold Patlwgenic for Droso- 

 phila niclanogaster 153 



YOUNG, DONNELL B. Nuclear Regeneration in Stylonyehia 



ntytilus 163 



MINNICH. D\\ K;IIT KL.MF.R. TJie Chemical Sensitivity of the 



Tarsi of Certain Mnseid 1'lies 166 



ii 



