XIII 



PHYLUM CHORDATA 



445 



closely adherent to the testis, forms the proximal part of the vas 

 deferens. The vasa defer entia (v. d.) terminate by opening into a 

 urinogenital canal, or urethra, into which the neck of the urinary 

 bladder is continued. A prostate gland (pr.) surrounds the com- 

 mencement of the urethra, the neck of the bladder and the 

 terminal parts of the vas deferentia. A diverticulum of the urethra 

 the icterus masculinus (u. m.)^lies embedded in the prostate 

 gland close to the neck of the bladder. A small pair of ovoid 

 glands, Couipers glands (c.gl.}, lie just behind the prostate close to 

 the side of the urethra. 



The terminal part of the urethra traverses a cord of vascular 

 tissue, the corpus spongiosum (c. s.\ which forms the dorsal portion 

 of the penis. The greater part of the penis is formed of two 

 closely approximated firm cords of vascular tissue the corpora 

 cavernosa (c. c.) which are attached proximally to the ischia ; and 

 it terminates in the slightly dilated, soft, conical glans penis (g. p.). 

 A loose fold of skin, the prepuce, encloses the penis. A pair of 

 glands with an odorous secretion, the perineal glands (p. gl.\ open 

 at the sides of the penis : two similar glands, the rectal glands 

 (r. gl.\ lie at the sides of the rectum. 



In the female the ovaries (Fig. 1035, ov.) are small ovoid bodies 

 attached to the 

 dorsal wall of the 

 abdomen behind 

 the kidneys. The 

 Gi'onfiiin, follicles 

 enclosing the ova 

 form only very small 

 rounded projections 

 on their outer sur- 

 face. 



The oviducts in 

 the anterior part 

 of their extent(.F#/- 

 lopiantubes,fl.t.) are 

 very narrow and 

 slightly convoluted. 

 They open into the 

 abdominal cavity 

 by wide funnel- 

 shaped openings, 

 (fl.t'.) with fimbri- 

 ated or fringed mar- 

 gins. Posteriorly each passes into a thick- walled uterus (r. ut.). 

 The two uteri open separately into a median tube, the vagina (va.). 

 The vestibule (Fig. 1034, vb.\ or urinogenital canal, is a wide 

 median passage, into which the vagina and the bladder open. 



r.ut 



FIG. 1035. Lepus cuniculus. The anterior end of the 

 vagina, with the right uterus, Fallopian tube and ovary (nat. 

 size). Part of the ventral-- wall of the vagina is removed, and 

 th$ proximal end of the left uterus is shown in longitudinal 

 section ; /. t. Fallopian tube ; fl. t'. its peritoneal aperture ; 

 I. ut. left uterus ; 1. ut'. left os uteri ; r. ut. right uterus ; r. ut'. 

 right os uteri ; s. vaginal septum ; va. vagina. (From Parker's 

 Zootomy.) 



