DIGESTIVE TRACT. 



37 



?HV 



hPV 



:.SV 



FIG. 39. Alimentary tract of dog- 

 fish {Acanthias'). a, dorsal aorta ; b, 

 bile duct ; //, heart ; i, intestine, the 

 spiral valve showing through ; /, liver ; 

 m, mesonphros; /, pancreas; r, rectal 

 gland ; s, spleen ; st, stomach. 



FIG. 40. Alimentary canal of Pro- 

 topterus, after Parker. C, cloacal 

 caecum ; G, gall bladder ; JfV, hepatic 

 vein ; L, liver ; O, cesophagus ; OD, 

 oviduct; PV, pyloric valve; Jf, rec- 

 tum ; RD, renal (mesonephric) duct ; 

 S, stomach ; SP, spleen ; S V, spiral 

 valve ; V, vent. 



