96 LOLIGO PEALII. 



c) This glandular organ is the liver. Its posterior limit may be found 



in a pointed projection beneath the kidneys. 



d) Passing into the head in company with the oesophagus is the an- 



terior aorta previously mentioned in this exercise. Locate it. 

 Just under the anterior end of the liver is a small median salivary 

 gland whose duct also follows the oesophagus into the head. 



e) Snip the mesenteries that tie down the rectum and ink bag and turn 



these organs back. Just where the intestine of which the 

 rectum is a continuation bends upward from the other organs 

 beneath it passes between the two lobes of a gland sometimes 

 called the spleen, sometimes the pancreas. Just in front of this 

 organ, on the left side of the body, the anterior aorta and the oeso- 

 phagus emerge from the liver, having passed through it from 

 beneath. 



f) A pair of very delicate transparent hepatic ducts arise from the liver 



near the same point and pass back through the lobes of the pan- 

 creas with which they are intimately connected. 



g) A thick walled stomach follows next. Find the points where the 



oesophagus enters and the intestine leaves this organ. Trace also 

 the anterior aorta back to the systemic heart. 



h) Connected with the stomach is a large thin walled blind sac ex- 

 tending back and occupying most of the conical space enclosed by 

 the walls of the mantle cavity. The hepatic ducts, previously 

 noted, probably pour their secretions into this sac instead of 

 directly into the stomach. 



THE REPRODUCTIVE SYSTEM. 



Technical Note. Sever the mesenteries and carefully remove the penis and 

 all organs attached to it. Place in water and straighten out the parts 

 as much as possible. 



You should be able to make out the following divisions: 



a) The spermatophoric sac following the penis and forming much 



the largest division of the tract. In contains the spermatophores. 



b) Bending forward from the posterior end of the spermatophoric sac 



