INTRODUCTION. 



XXlll 



the summit of a somewhat tubular extension of the 

 stomach (Woodcut, fig. viii. pv), which forms a kind of 

 vestibule to the intestine, and is richly clothed with cilia. 

 Into this space, which may be distinguished as the py. 

 loric vestibule, the indigestible elements of the food are 

 gradually gathered ; and here they are formed by the action 



Fig. ix. 



Bowerbankia. — g. Gizzard, c. Cardia. 



of the cilia into pellets, which are kept in rapid rota- 

 tion, and ultimately pass into the intestine. In other 

 cases (as in Bowerbankia, Woodcut, fig. ix.) the intestine 



