Plate I.— First Dissection of the Skate. {Ad 7tat.) 



Coracp-mandibular Muscle 

 thrown forward. 



Thyroid, 

 Branchial Artery. -Ov 



Ventricle of Heart.-- •^* 



odeno-hepatic Mesenterj- * 



with Bile-duct, 

 Portal Vein and 



t Lobe^»^ Coeliac Artervx 



Liver. 



\ „^.*«»Oro-nasal Groove. 



^^Xjill supplied by first 

 Afferent Branchial. 



Ileum, with 

 Spiral Valve. 



Pancreas. ' 



ectal Gland. 



Abdominal Pore. 



Cloac 



The ventral body- wall has been removed completely from the abdominal region, 

 exposing the alimentary system in the abdominal cavity. The lobes of the liver 

 have been spread out and the stomach slightly drawn away to the left. Anteriorly 

 the skin has been removed from the region between mouth and coracoid bar and the 

 afferent branchial system dissected out on the left side only. The heart is lying in 

 its natural position in the pericardium. The veins are blue, arteries red. 



