FIG. 326 



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

 328. Chimjeroid, Callorhynchus. 329. Lung-fish, Protopterus. (After W. N. FARKER.j 

 ■3,10. GTmoxd., Acipenser sturio. 331. Perch. (After WIEDERSHEIM.) r^r r\ 



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 cceca (pancreas). PY. Pyloric end of stornach 

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



valve. 



262 



