394 



C. H. DANFORTH 



right side of the oesophagus becomes embedded in the hver for a 

 short distance near the pyloric end of the stomach. From the 

 part of the vessel which lies within the liver and from its immedi- 

 ate subdivisions the posterior hepatics arise. A few small twigs 

 also enter the dorsal side of the liver from the oesophageal ar- 



cor. cp. ch. ha, acabd.add. thv. thd. 



Fig. 1 Sketch to show the relations of coronary and hepatic arteries in 

 Scaphirhynchiis. 



abd, artery to abductor mviscle of pec- 

 toral fin 



add, artery to abductor muscle 



aoe, oesophageal artery 



ac, arteria apicis cordis 



br 3, br 4, third and fourth efferent 

 branchial arteries 



ch, common trunk of posterior c(jronary 

 and ant. hepatic arteries 



coca, coraco-arcualis (epigastric) artery 



come, coeliaco-mesonterie artery 



cor, coracoid artery 



da, dorsal aorta 



ha, hp, anterior and posterior hepatic 



arteries 

 liv, liver 



}nd, mandibular artery 

 oe, oesophagus 

 sub, subclavian artery 

 thd, thv, thoracico-dorsalis and -ven- 



tralis arteries 

 va, ventral aorta 



teries which are derived from the coehaco-mesenteric and fourth 

 efferent branchial arteries. 



The anterior hepatic and posterior coronary arteries arise from 

 a common trunk {ch) which in turn comes from the coracoid 

 branch {cor) of the subclavian. This is the condition found in 

 skates, which suggests that the vessels are homologous. Both 

 the anterior hepatic and posterior coronary arteries, however, 



