Fig. 271, A. — Diagram of dissection to show principal organs of Necturus. 1, af- 

 ferent branchial artery, I ; 2, bulbus arteriosus ; S, afferent branchial artery, II ; 

 i, afferent branchial artery. III ; 5, ventricle ; 6, hepatic sinus ; 7, subclavian 

 artery; S, postcaval vein; 0, dorsal aorta; 10, right lung; 11, postcardinal vein; 

 12, liver; IS, hepatic portal vein; 11,, gastrosplenic vein; 15, pancreas; 16, gall 

 bladder; It, ventral abdominal vein; IS, testis; 19, kidney; SO, renal portal vein; 

 21, pelvic vein; 22, caudal vein; 23, mesonephric duct; 21/, gill slit; 25, external 

 gills; 26, internal jugular vein; 27, left auricle; 28, external jugular vein; 29, sub- 

 clavian vein; SO, common cardinal vein or duct of Cuvier ; 3/, gastric artery; S2, 

 left lunng ; SS, pulmonary vein ; Sk, stomach ; S5, spleen ; 36, pylorus ; 37, duodenum ; 

 S8, mesenteric vein; S9, ileum; J,0, large intestine; Jil, femoral vein; 1)2, urinary 

 bladder; JiS, vesical vein; H, cloaca. (Courtesy of General Biological Supply 

 House.) 



