ALIMENTARY CANAL 



257 



ab. 



v. 



FIG. 155. A, alimentary 

 canal and liver of a 

 female Protopterusjrom 

 the left side. Part of 

 the left wall of the 

 stomach and intestine, 

 and the peritoneal in- 

 vestment of the spleen 

 have been removed, a.p, 

 Abdominal pore ; b.d, 

 bile-duct ; b.ent, Bursa 

 Entiana ; cl, cloaca ; 

 cl.ap, cloacal aperture ; 

 cl.c, caecum cloacae ; 

 c.m.a, coeliaco - mesen- 

 teric artery ; cy.d, bile 

 duct ; k.d, kidney duct ; 

 m.a, mesenteric ar- 

 teries ; od, oviduct ; 

 pt.c, post - caval vein 

 or inferior vena cava ; 

 p.v, portal vein ; the 

 other reference letters 

 as in B. (From 

 Newton Parker.) B, 

 viscera of an adult 

 female Lepidosteus, ven- 

 tral view. The oeso- 

 phagus, the commence- 

 ment of the intestine 

 and the rectum have 

 been laid open. ab, 

 air-bladder ; an, anus ; 

 b.d, intestinal aperture 

 of the bile-duct ; g.b, 

 gall-bladder ; gl, oeso- 

 phageal aperture of the 

 air-bladder ; h.d, hep- 

 atic duct ; I, liver ; oes, 

 oesophagus ; py, py- 

 lorus ; py.c, pyloric 

 caeca ; py.c', the four 

 intestinal orifices of the 

 pyloric caeca ; r, rec- 

 tum ; s, spleen ; sp.v, 

 spiral valve ; st, 

 stomach. (From Bal- 

 four and Newton 

 Parker.) 



r 



an.. 



VOL. VII 



