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- 



3 cL uXa 



FlG. 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. 

 Cowper's gland; g. cl, glans clitoridis; g. f>, glans penis;/, gl, perineal gland; 

 /. gl , aperture of its duct on the perineal space; /r, anterior, pr' , posterior, and 

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

 genital aperture; it. ?u , 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 



