BIOLOGICAL BULLETIN 



OF THE 



flDarine Biological Xaborator$ 



WOODS HOLL, MASS. 



Vol. XIII 



June, 1907 



No. 



CONTENTS 



Page 



Glaser, O. C. Pathological Amitosis in the Food- 

 ova of Fasciolaria i 



Smith, Bertram G. The Life History and Habits of 



Cryftobranchus alleghenien- 

 sis 5 



King, Helen Dean Food as a Factor in the Deter- 

 mination of Sex in Amphib- 

 ians 40 



Published Monthly by the 

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