184 THE ZOOLOGIST. 



surface of the back part of the gullet is covered with papillae 

 which are more thickly congregated just above the oesophagus 

 (fig. I.). 



MORMYRID^. 



A family of fishes found in the Nile and other rivers of 

 tropical Africa. 



Fig. I. 



Mormyrus kannume, from the Nile, has only five small gill- 

 rakers on the first cerato-hypobranchial arch, with four very 

 minute ones on its epibranchial. There are also minute gill- 

 rakers on the inside of this arch. Both sides of the second and 

 third arches and the outside of the fourth arch carry minute 

 but more numerous gill-rakers. There is a long strip of minute 

 teeth on the tongue up to the junction of the second gill-arch. 



