LOLIGO PEALII. 97 



and running along its left side for half its length is the vas ef- 

 ferens, a tube of smaller diameter than the penis. 



c) The vas efferens ends in an enlarged convoluted portion of the tract, 



the seminal vesicle. This has two or three minor divisions. 



d) From the seminal vesicle the convoluted vas deferens leads poste- 



riorly. 



e) Remaining in the mantle cavity beneath the blind sac of the stomach 



is the large, flat, elongated testis. The student will note that it 

 was not connected with the rest of the reproductive tract, but is 

 attached to the stomach. It lay in a thin membranous capsule of 

 its own which was probably torn in the dissection. The vas 

 deferens communicated with this capsule. 



In the female the single ovary occupies a position corresponding to 

 that of the testis in the male. It is likewise surrounded by a capsule, 

 which in this case communicates with an oviduct running forward and 

 opening into the mantle cavity to the left of the rectum. Along its 

 course is the oviducal gland. A pair of large light colored nidi- 

 mental glands overlie all the other organs in the central region of 

 the body. These secrete the shells or capsules for the eggs. 



Exercise 6. Remove the alimentary tract, 'with the attached testis, place in 

 water, arrange the parts in proper order, and make a diagram or 

 sketch. 



Exercise 7. Sketch the parts of the male reproductive system. 



Exercise 8. Open the pharynx and examine the beak. Draw the latter. 



Exercise 9. Open the spermatophoric sac and secure some of the slender 

 spermatophores. Place in a watch glass and examine with lens or 

 microscope. Draw one of the spermatophores on an enlarged scale, 

 showing the enclosing sheath, the coiled discharging apparatus, and 

 the opaque mass of spermatozoa. 



Exercise 10. Remove the pen entire by making an incision carefully in the 

 mid-dorsal line of the mantle and withdrawing the pen from its 

 sheath or pocket. Draw the pen. 



