PYLORIC APPENDAGES OF FISHES. 



429 



commissariat is the most simple in the Piscine class. The 

 Lamprey, at the head of the Dermopterous order, derives from 

 the slight spiral extension of its intestinal mucous coat the 



286 



Portion of the alimentary canal of the Salmon (Salrno salar), showing one double row of caecal 

 appendages and portions of the other, ccxxxi. 



required concomitant complexity of the digestive canal. In 

 several Osseous Fishes, either the inactive nature of the species, 

 or the extent or special modifications (the long intestine and 

 glandular palate of the Carp, the thickened mucous membrane 



