^/^^ 



THE ANCESTRY 



OF 



VERTEBRATES 



AS A MEANS OF UNDERSTANDING 

 THE PRINCIPAL FEATURES OF THEIR 

 STRUCTURE AND DEVELOPMENT 



BY 



Dr. H. C. DELSMAN. 



Published with support of the 

 Koninklijke Natuurkundige Vereeniging 



(Batavia). ^ %^ 



N. V. BOEKH. VISSER & Co. 

 Weltevreden (Java). 



VALKHOFF & Co. 

 Amersfoort (Holland). 



192 2. 



