XII 



PHYLUM CHORDATA 



519 



across, its substance is seen to be divided into a central 

 mass or medulla and a peripheral portion or cortex. An 

 adrenal (suprarenal) body lies in contact with the anterior 

 end of each kidney. The ureter (Fig. 312, ur) runs back- 



ur 



VL . 



II 



3? 



FIG. 312. Lepus CuniculUS. The urogenital organs. A, of male; B, of female, 

 from the left side (half nat. size). The kidneys and proximal ends of the ureters, 

 and in B, the ovaries, Fallopian tubes and uteri are not shown, an, anus; bl, 

 urinary bladder; c. c, corpus cavernosum; c. s, corpus spongiosum; c.gl t 

 Cowper's gland; g. cl, glans clitoridis; g. p, glans penis; p. gl, perineal gland; 

 /. ft', aperture of its duct on the perinea! space ; pr, anterior, pr , posterior, and 

 Pr ', lateral lobes of prostate; ret, rectum; r. gl, rectal gland; u. g. a, urino- 

 genital aperture; u. HI, uterus masculinus; ur, ureter; -va, vagina; vb, vesti- 

 bule; v. d, vas deferens. (From Parker's Zootomy.) 



wards to open not into a cloaca but directly into the urinary 

 bladder (bl). The latter is a pyriform sac with elastic 

 walls which vary in thickness according as the organ is 



