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. H. Parker. 



With Three Plates. 



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



PRINTED FOR THE MUSEUM. 



October, 1899. 



