FIG. 326 



Figs. 326-331. — Digestive tracts of fishes. 326. Cy dostome, Pefromyzon. 327. Shark. 

 328. Chimaeroid, Callorhyjichus. 329. Lung-fish, Protopterus. (After W. N. PARKER.) 

 330. Ganoid, Acipenser sturio. 331. Perch. (After Wiedersheim.) 



A. Anus. BC. Branchial chamber. BE. Bursa entiana (duodenum). CL. Cloaca. 

 GC. Gill openings. /. Intestine. M. Mouth. MI. Mid-gut. NN' . Anterior and poste- 

 rior nares. OE. Gullet. PC. Pyloric coeca (pancreas). PY. Pyloric end of stomach. 

 R. Rectum. RG. Rectal gland. ^. Stomach. SP. Spiracle. SP. V. Spiral intestinal 

 valve. 



262 



