474 



ZOOLOGY 



SECT. 



they retain throughout life in the Pigeon, pass backwards and 

 downwards as the animal approaches maturity, until they come to 

 lie each in a scrotal sac situated at the side of the urinogenital 

 opening. The cavity of each scrotal sac is in free communication 

 with the cavity of the abdomen by an opening the inguinal canal. 

 The sperms have an oval compressed " head " 0'005 mm. in length 

 and a slender " tail " 0'045 mm. long. A convoluted tpididymis 

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

 deferens. The vasa deferentia (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 part of the vasa deferentia. A diverticulum of the urethra 

 the uterus masculinus (u. m.) lies embedded in the prostate 

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

 glands Cowpers 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 cores of vascular tissue the corpora 

 cavernosa (c.c.\ which are attached proximally to the ischia, and 



terminate in a 

 lut pointed apex (g.p.). 



A loose fold of 

 skin, the prepuce, 

 encloses the penis. 

 A pair of glands 

 with an odorous 

 secretion, the 

 perineal glands 

 Q;.^.), open on the 

 perineal space at 

 the base of the 

 penis : two similar 

 glands, the rectal 

 glands (r. gl.J, lie 

 on either side of 

 the rectum. 



In the female 

 the ovaries (Fig. 

 1098, ov.\ are 

 small ovoid bodies 

 attached to the 

 dorsal wall of the abdomen behind the kidneys. The Graafian 

 follicles enclosing the ova form only very small rounded projections 

 on their outer surface. 



l.ub' 



va 



r.ut 



FIG. 1098. 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 

 the proximal end of the left uterus is shown in longitudinal 

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

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

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

 Zootomy.) 



