Bulletin of the Museum of Comparative Zoology 
AT HARVARD COLLEGE. 
Vor. XXX. No. 5. 
THE MESENTERIES AND SIPHONOGLYPHS IN METRIDIUM 
MARGINATUM MILNE-EDWARDS. 
Bv G. H. PARKER. 
Wira ONE PLATE. 
CAMBRIDGE, MASS., U. S. A.: 
PRINTED FOR THE MUSEUM. 
March, 1897. 
