XIII 



PHYLUM CHURDATA 



473 



The special features of the luicldlc car with its auditory ossicles, 

 and of the external ear, have been already referred to. 



Urinogenital Organs. — The kidneys are of somewhat com- 

 pressed oval shape, with a notch or hilus on the inner side. They 

 are in close contact with the dorsal wall of the abdominal cavity, 

 the right beino- somewhat in advance of the left. Towards the 

 hilus the tubules of the kidney converge to open into a wide 

 chamber — the pelvis — which forms the dilated commencement of 

 the ureter. When the kidney is cut across, its substance is seen to 



u.^.a 



luj.a 



Fu;. lO'.i;.— tepus cuniculus. The urinogenital organs ; A, of male ; B, of female ; from the 

 left side (lialf nat. size). The kidneys and proximal ends of the ureters, in A the testes, and 

 in .B the ovaries, Fallopian tubes and uteri are not shown, aa. anus; hi. urinary bladder ; 

 c. c. eorpus cavernosum ; c. s. cori^us spongiosum ; (,-. id. Cowper's gland ; </. d. ajjex of clitoris ; 

 y.y). apex of penis ; p. ijl. perineal gland ; p. ;/('. aperture of its duet on the perineal space ; pr. 

 anterior, pr' . posterior, and pr". lateral lobes of prostate ; rcl. rectum ; r. yl. rectal gland ; 

 v.. g. a. urinogenital aperture ; v.. m. uterus masculinus ; ur. ureter ; va. vagina ; cO. vesti- 

 bule ; V. d. vas deferens. (From Parker's Zootoray.) 



be divided into a central mass or mechiUa and a peripheral portion 

 or cortex. An adrenal {supraA'cnal) hody lies in contact with the 

 anterior end of each kidney. The ureter (Fig. 1097, v/r.) runs 

 backwards to open not into a cloaca, but directly into the urinary 

 Uadder (]>/.). The latter is a pyrifoim sac with elastic walls which 

 vary in thickness according as the organ is dilated or contracted. 

 In the male the openings of the ureters are situated nearer the 

 posterior, narrower end or neck than in the female. 



In the male Rabbit the teda are oval bodies, which, though in 

 the young animal they occupy a similar position to that which 



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