BIOLOGICAL BULLETIN 



OF THE 



flDarine Biological Xaborator^ 



WOODS HOLE, MASS. 



VOL. LI NOVEMBER, 1926 No. 5 



CONTENTS 



BECKER, ELERY R. The Flagellate Fauna of the Ccecum of the 



Striped Ground Squirrel, Cilellus tri- 

 decemlineatus, -with Special Reference to 

 Chilomastix magna sf>. nov 287 



BIGELOW, ROBERT PAYNE. Variation in the Number of Fin-Rays in 



Three Species of Fundulus of the Woods 

 Hole Region 299 



TANNREUTHER, GEORGE W. Life History of Prorodon griseus 303 



BAKER, WOOLFORD B. Studies in the Life History ofEuglena. 321 



BODINE, JOSEPH HALL. Hydrogen Ion Concentration in the Blood 



of Certain Insects (Orthoptera) 363 



PUBLISHED MONTHLY BY THE 



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



