166 



ZOOTOMY. 



168. The mesorchium (Fig. 41, ms.o), a fold of peri- 

 toneum suspending each testis to the dorsal body-wall : a 

 similar fold (b.lg) supports the epididymis, and is attached 

 in front along the line of junction t>f the colourless and 

 pigmented regions of peritoneum ( 133). 



FIG. 41. Lacerta viridis. The male urinogenital organs (nat. size). 

 The ventral wall of the cloaca is removed, the bladder is turned to the 

 animal's right, and the peritoneal covering of the left testis and 

 epididymis is dissected away. 



M, urinary bladder : b Ig, fold of peritoneum supporting epididymis : 

 r/ 1 , anterior, and cl~, posterior, division of cloaca: ep, epididymis: k, 

 kidney : ms.o, mesorchium : p, copulatory organs, of which the right is 

 shown retracted (p') and the left everted (p) : r.m, retractor muscle of latter : 

 r, ridge separating anterior and posterior divisions of cloaca : ret, rectum : 

 ret', its opening into the cloaca : t, testis : u.g, urinogenital papilla and 

 aperture : v.d, vas deferens. 



