Bulletin of the Museum of Comparative Zoology 
AT HARVARD COLLEGE. 
Vou, 2. . No:. 2. 
THE EARLY DEVELOPMENT OF LEPAS. A STUDY OF 
CELL-LINEAGE AND GERM-LAYERS. 
By Maurice A. BIGELow. 
Witu Twe.ve PuAtsEs. 
CAMBRIDGE, MASS., U.S. A.: 
PRINTED FOR THE MUSEUM. 
Jury, 1902. 
