BIOLOGICAL BULLETIN 



OF THE 



flDartne Biological Xaboratorp 



WOODS HOLE, MASS. 



VOL. XLIX 



OCTOBER, 1925 



No. 4 



KEPNER, WM. A., 

 and PICKENS, A. L. 



HEILBRUNN, L. V. 

 KOEHRING, VERA. 

 BREITENBECHER, J. K. 



TORREY, HARRY BEAL, 

 and HORNING, BENJAMIN. 



HYMAN, L. H. 



CONTENTS 



Trichodina steinii (C. and L.} from Pla- 

 naria polychora (0. Schm.) 237 



Studies in Artificial Parthenogenesis. V.. . 241 

 The Spermatheca of Eurycea bislineata. . 250 



The Inheritance of a Macula Mutation 

 Concerned with Elytral Spotting and 

 Latent Traits in the Male of Bntchus. . 265 



The Effect of Thyroid Feeding on the 

 Moulting Process and Feather Structure 

 of the Domestic Fowl 275 



On the Action of Certain Substances on 

 Oxygen Consumption 288 



PUBLISHED MONTHLY BY THE 



MARINE BIOLOGICAL LABORATORY 



PRINTED AND ISSUED BY 



LANCASTER PRESS, INC. 

 LANCASTER, PA. 



AGENT FOR GREAT BRITAIN 



WHELDON & WESLEY, LIMITED 



2, 3 and 4 Arthur Street, New Oxford Street, London, W. C. 2 



Single Numbers, $1.00. Per Volume (6 numbers), $4.50 



October 10. loos, at Lancaster. Pa., as second-class matter under Act of Congress of July 16. 1804 



