FIG. 326 



Figs. 326-331. Digestive tracts of fishes. 326. Cyclostome, Petromyzon. 327. Shark. 

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

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



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

 GC. Gill openings. 7. 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. S. Stomach. SP. Spiracle. SP. V. Spiral intestinal 

 valve. 



262 



