Bulletin of the Museum of Comparative Zoology 

 AT HARVARD COLLEGE.. 



Vol. LIII. No. 3. 



MATURATION, FERTILIZATION, AND SEGMENTATION OF PEN- 

 NARIA TIARELLA (AYRES) AND OF TUBULARIA CROCEA (AG.). 



By Geokge T. Hargitt 



With Nine Plates. 



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



PRINTED FOR THE MUSEUM 



October, 1909. 



