KWK 



TEXT-BOOK 



OF THE 



MBRYOLOGY OF INVERTEBRATES 



BY 



Dr. E. KORSCHELT 



Professor of Zoology &= Comparative 



Anatomy in the Uiiiversity of 



Marbu7-g 



Dr. K. HEIDER 



Professor of Zoology in the 

 University of Berlin 



Translated from the German 



BY 



EDWARD L. MARK Ph.D 



Herscy Professor of Anatomy in 

 Harvard University 



W. Mc M. WOODWORTH Ph.D 



Instructor in Microscopical Afjatomy 

 in Harvard University 



With Additions by the Authors and Translators 



PART I 



PORIFERA, CNIDARIA, CTENOPHORA, VERMES, 

 ENTEROPNEUSTA, ECHINODERMA TA 





1934 } 



Xonöon 

 SWAN SONNENSCHEIN & CO., 

 NEW YORK : MACMILLAN & CO 

 1895 



LiMn 



