Bulletin of the Museum of Comparative Zoology 

 AT HARVARD COLLEGE. 



Vol. LIIL No. 3. 



MATURATION, FERTILIZATION, AND SEGMENTATION OF PEN 

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



By George T. Hargitt 



With Nine Plates. 



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



PRINTED FOR THE MUSEUM 



October, 1909. 



