156 THE SPINY DOGFISH -THE SKATE 



Make a median incision on the ventral surface, cutting through the body- 



Fkj. 52. — The Dogfish (AcaTUhias, syn. SqiMida). Dissection showing the alimentary 



system, etc. 



wall from between the pectoral fins to the cloaca, so as to expose the internal 

 organs. 



