LOUGO PEALII. 129 



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

 near the pointed, posterior end of the spermatophoric sac and 

 lies along its right side. This conducts the formed spermato- 

 phores to the spermatophoric sac, and is sometimes called the 

 vas efferens. 



(6) A swollen portion that lies on the right of the anterior end 

 of the spermatophoric sac in which the spermatophores are 

 formed, the spermatophoric tube. 



(c) A narrow and convoluted tube that leads posteriorly 

 from the seminal vesicle alongside the vas efferens and on to 

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

 rately as the fas deferens. 



The testis is a large, white organ that extends, from the region 

 of the stomach, posteriorly to the end of the body, dorsal to the 

 visceral sac. 



Draw a figure of the male reproductive system. 



Open the base of the penis and remove a number of spermato- 

 phores. Place them in a watch-glass in water and examine 

 with a microscope. Notice: 



1. The sheath. 



2. The packet of spermatozoa. 



3. The spiral discharging portion. 

 Draw. 



Why are the spermatozoa contained in spermatophores? 



Female Reproductive System. The opening of the oviduct 

 has already been noticed. Observe: 



(a) The large, swollen portion, the oviducal gland, that lies 

 dorsal to the left branchial heart. 



(6) The oviduct leaving the dorsal portion of the gland. The 

 oviduct is long and convoluted, and is frequently filled wrth eggs. 

 This depends on the season of the year. 



(c) The lighter colored, greatly lobulated ovary, also fre- 

 quently filled with eggs, lying dorsal to the oviduct and visceral 

 sac and extending from the region of the stomach to the end of 

 the body. The ovary is inclosed in a capsule from which the 

 oviduct leads. 

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