author's abstract of this paper is- 

 sued BT THE BIBLIOGRAPHIC SERVICE. 



THE DEVELOPMENT OF THE PARAPHYSIS AND 

 PINEAL REGION IN MAMMALIA 



JOHN WARREN 



From the Anatomical Department, Harvard Medical School 



THIRTY-FIVE FIGURES 



CONTENTS 



Introduction 75 



Part I. Sheep embryos 77 



1. The primary arches and subdivisions of forebrain 77 



2. Paraphysal arch and paraphysis 78 



3. Velum transversum 80 



4. Postvelar arch 81 



5. The epiphysis 81 



6. The commissures 82 



7. Conclusions 83 



Part II. Human embryos 83 



1. Primary arches in the roof of the forebrain 83 



2. Paraphysal arch and paraphysis 84 



3. Postvelar arch and postvelar tubules or diverticuli 87 



4. Conclusions 94 



Part III. Mammalian embryos in general 94 



1. Marsupials ' 94 



2. Rodents 95 



3. Ungulates 97 



4. Carnivora 98 



Conclusions 100 



Bibliography 102 



INTRODUCTION 



The object of this paper is to describe the appearance of the 

 primary arches in the roof of the forebrain which have not as 

 yet been reported in mammaha and also the presence of a mam- 

 maUan paraphysis, as there has been much doubt as to its exist- 

 ence in any members of this class of vertebrates. The other 

 features of this region, the velum, choroid plexus, epiphysis 

 and commissures will only be discussed in a general way, espe- 



75 



