Contributions from the Zoological Laboratory. 



KARYOKINESIS and CYTOKINESIS 



Maturation, Fertilization and Cleavage 



CREPIDULA and other GASTEROPODA 



EDWIN O. CONKLIN, 



PROFESSOR OF ZOOLOGY. 



REPRINTED FROM THE JOURNAL OF THE ACADEMY OF NATURAL SCIENCES OF 

 PHILADELPHIA, SECOND SERIES, VOL. XII, PART I. 



1902. 



