FIG. 326 



SPY 



BC GC 



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

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

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



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

 GC. Gill openings. /. Intestine. M. Mouth. ML 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 



