Bulletin of the Museum of Comparative Zoology 

 AT HARVARD COLLEGE. 



Vol. XXXV. No. 3. 



STUDIES FROM THE NEWPORT MARINE LABORATORY 

 COMMUNICATED BY ALEXANDER AGASSIZ. 



XLII. 



LONGITUDINAL FISSION IN METRIDIUM MARGINATUM 



MILNE-EDWARDS. 



By G. II Parker. 



With Thkke Platks. 



CAMBRIDGE, MASS., U.S.A.: 



PRINTED FOR THE MUSEUM. 



October, 1899. 



