Figs. 326-331. — Digestive tracts of fishes. 326. Cyclostome, Pefromyszon. 327. Shark. — 
328. Chimzeroid, Callorhynchus. 329. Lung-fish, Protopterus. (After W. N. PARKER.) — 
330. Ganoid, Acipenser sturio, 331. Perch. (After WIEDERSHEIM.) 
A. Anus. AC, Branchial chamber. BZ. Bursa entiana (duodenum), CL. Cloaca, — 
GC. Gill openings. /. Intestine. J. Mouth, MM/. Mid-gut. NN’. Anterior and poste- 
rior nares. OZ, Gullet. PC. Pyloric coeca (pancreas). PY. Pyloric end of stomach, — 
Fe Rectum. #G, Rectal gland, S, Stomach. SP. Spiracle. SP. V. Spiral intestinal — 
valve, 
262 
