C O N T E N T S. 



page 



I. Introduction 3 



II. The characters investigated 5 



1. Number of vertebrae 5 



2. Number of anal raj'S 7 



3. Number of branchiostegal rays 9 



4. Number of pectoral rays 13 



5. Number of caudal rays 16 



6. Summary 17 



III. The eel compared with the viviparous blenny (Zoarces viviparus) . . 18 



