CIRCULATORY SYSTEM OF ELASMOBRANCHS. 455 
Puate I. 
Diagram showing the general disposition of the main venous trunks in Seyllium 
canicula. The more dorsally situated vessels are stippled and tie wore ventral ones 
black. For the sake of clearness, the ventral cutaneous vein has been omitted. 
Puate II. 
Fig. 1. Sketch of the arrangement of the Hepatic Portal factors seen from the dorsal 
side. The vessels were injected and the gut hardened and removed whole 
from the body-cayity. 
Fig. 2. Diagram of the main vessels of the anterior end of the Dogfish viewed from 
the side in order to give their dorso-ventral relations. 
