TEXT-BOOK 



OF THE 



EMBRYOLOGY OF INVERTEBRATES 



BY 



Dr. E. KORSCHELT 



Professor of Zoology (Sr» Comparative 



Anatomy in the University of 



Marburg 



Dr. K. HEIDER 



Professor of Zoology in the 

 University of Berlin 



Translated from the German 



BY 



EDWARD L. MARK Ph.D 



W. Mc M. WOODWORTH Ph.D 



Instructor in Microscopical Anatomy 

 in Harvard University 



With Additions by the Authors and Translators 



Hersey Professor of Anatomy in 

 Harvard University 



PART I 



PORIFERA, CNWAA'JA, CTENOPHORA, VERMES, 

 ENTEROPNE USTA, ECHINODERMA TA 



XouDon 



SWAN SONNENSCHEIN & CO., Limp 



NEW YORK: MACMILLAN & CO 



1895 



