LOLIGO PEALII. 119 



portion of the kidneys, and the systemic heart, a roughly diamond- 

 shaped organ that Ues between the branchial hearts. 



The stomaeh proper is a rather small, thick-walled sac that 

 lies on the right side of the body, dorsal and posterior to the right 

 branchial heart. From the left side of the stomach a rather 

 large opening leads into a thin-walled blind sac, the visceral sac, 

 that when filled with partly digested food, as it frequently is, 

 extends posteriorly to the end of the body and occupies a consid- 

 erable part of the conical portion of the body. When empty, 

 it is quite small and inconspicuous. 



The intestine leaves the stomach very near the point the eso- 

 phagus enters, and just anterior to the opening that leads into 

 the visceral sac. It passes ventrally, and becomes visible from 

 the surface, where its position has already been noted. 



Draw a figure showing the digestive system. 



Cut a median sagittal section of the buccal mass and notice 

 the mouth cavity, the jaws, the muscles that move the jaws, the 

 tongue, and the position of the radula. Is the radula arranged 

 in the strap-over-pulley manner that it is in Sycotypus f 



Draw a figure of the section. 



Male Reproductive System. — The position of the penis has 

 already been noticed. Cut the tissue away from the base of the 

 penis and notice the swollen spermatophoric sac in which the 

 spermatophores are formed. Through the walls of the base of 

 the penis and the spermatophoric sac, groups of slender, light- 

 colored spermatophores can be seen. They will be studied later. 

 The vas deferens consists of three distinct parts: 



(a) A narrow, straight portion that extends anteriorly from 

 near the pointed, posterior end of the spermatophoric sac and lies 

 along its left side. This is sometimes called the vas efferens. 



(b) A swollen portion that lies on the left of the anterior end 

 of the spermatophoric sac, the seminal vesicle. 



(c) A narrow and convoluted tube that leads posteriorly 

 from the seminal vesicle alongside the portion described in (a), 

 to the capsule of the testis. This is sometimes referred to sepa- 

 rately as the vas deferens. 



