XII. EXPLANATION OF THE PLATES. 



All figures were drawn from actual dissections. Fig. i was compiled from 

 the dissections of three or four specimens, the others from a single specimen. 



The arteries are colored red and the veins blue. A vessel drawn in dotted 

 lines signifies that it passes in or behind a bone, muscle, or organ. 



PLATE I. 

 Ophiodon elo7igatiis ; Blue cod. 



Fig. I. Represents a general lateral view of the vascular system. The hyoid 

 vessels are cut and the arch moved caudad from its natural position to 

 show the deeper branchial vessels, and a considerable part of the caudal 

 portion of the body between the vent and the caudal fin is left out. 



2. Dorsal view of an injected gill or branchial filament. Meshes of the 

 capillary network are diagrammatic and are greatly enlarged. Injected 

 with Hoyer's chrome jellow gelatin mass. Natural size. 



3. Dorsal view of a pseudobranchial filament. Efferent vessels in yellow. 

 Its network is also greatly enlarged. Injected as Fig. 2. Natural size. 



4. Lateral view of a portion of the efferent pseudobranchial filament 

 artery. Injected as Fig. 2. Leitz 3. Oc. i. X/4- 



5. Represents a ventral view of the union of the efferent branchial ar- 

 teries to form the main arterial trunks, and also the large veinous 

 trunks emptying into the precaval veins. Only the left dorsal branchial 

 retractor muscle is indicated. A 15 lb. Opkt'odon, X ^• 



6. A portion of the viscera from the left and dorsal side. Opposite side 

 of the stomach shown from Fig. i. 40 lb. Ophiodon, y^%. 



7. Origin of the caudal vein from the ventral side, showing its relations 

 with the lymphatic system. 15 lb. Ophiodou, X^- 



8. Deeper dissection of Fig. 7. showing the ending of the caudal artery. 



9. Anterior view of a caudal vertebra, showing the caudal trunks in sec- 

 tion. 15 lb. OpJiiodon, 'X}i. 



10. General lateral view of the blood supply to the kidney, testes, and uri- 

 nary-bladder of a 15 lb. Ophiodcii, X/^- 



11. Dorsal dissection of the liver to show the main trunks. Portal system 

 in blue and hepatic sj'stem drawn in outline. 20 lb. Op/tiodon, X/^- 



