EXPLANATION OF PLATES OF VOL. V. 



447 



In all the figures of genitalia, the penis sac (p. s.) is represented in its natural posi- 

 tion to the left ; the genital bladder (g. b.) with its duct (d. g. b.) to the right of the 

 system. They can readily be distinguished without being indicated by lettering. The 

 same may be said of the testicle (t.), epididymis (ep.), accessory gland, (a. g.) prostate 

 (p.), vas deferens (v. d.), retractor of penis sac (r.), ovary (o.), oviduct (ov.), vagina 



