THE UROGENITAL SYSTEM OF MYXINOTDS^ 



JESSE LE ROY CONEL 



EIGHTY-FIVE FIGURES (TWELVE PLATES) 



CONTENTS 



Introduction 75 



Materials and methods 78 



Observations 79 



1. Excretory system 79 



Pronephros 79 



Mesonephros 108 



Bdellostoma ' 108 



Myxine 118 



2. Reproductive system 120 



Myxine 120 



Female 120 



Male 126 



Bdellostoma 128 



Female 128 



Male 130 



Protandric hermaphroditism in Myxinoids 131 



Summary 134 



Bibliography 136 



INTRODUCTION 



As is well known, Johannes Miiller was the first to investigate 

 the urogenital system of the Myxinoids, describing briefly both 

 male and female of Bdellostoma forsteri and the European Myxine 

 glutinosa. Since his day much has been written regarding this 

 subject. The investigators of the excretory organs include W. 

 MuUer (75), Kirkaldy ('94), Semon ('96), Spengel ('97), and 

 Maas ('97), all of whom worked upon the Myxine found in Euro- 

 pean waters. 



Weldon ('84) and Price ('10) are the only ones who have pub- 

 Hshed a description of the excretory apparatus of Bdellostoma. 



^ Contribution from the Zoological Laboratory of the University of Illinois. 

 No. 92. 



75 



