578 The A nhnal Kingdom 



(Vein 



Mouth 



Spiracle 



Afferent branchial 

 Ventral aorta 



Conus arteriosus 



{Atrium 

 Ventricle 

 Sinus venosus 



Common cardinal 

 (duct of Cuvier) 



Pectoral fin 

 Stomach 

 Hepatic porta 

 Bile duct 



Gall bladder 

 Pancreas 



Liver 



Ileum 



Coetom 



Cloaca 



Cloacal opening 

 Accessory ureter 



Clasper 

 Pelvic fin 



Centrum 

 Nerve (spinal) cord 

 Notochord 



•-Caudal artery 

 ' — Caudal vein 



Fig 194 The anatomy of Squalus acanthias, the dogfish shark. (From 



egner and Stiles: College Zoology, Copyright, 1951, The Macmillan Company,) 



