310 



ZOOLOGY 



SECTV 



msu 



of the auditory region: between the membranous wall of the 

 labyrinth and the investing bone is a small space containing 

 fluid, the pcrilympli. The labyrinth itself consists of the utriculus 

 with the three semi-circular canals and the sacculns with the 

 lagena (cochlea). The utriculus (u.) is a cylindrical tube, bent 

 round at a sharp angle ; the semi-circular canals (ca., ce., cp.) are 

 arranged as in the Frog (p. 265). A narrow tube, the ductus 



cndolympliaticus, leads upwards towards 

 the roof of the skull and ends blindly in 

 the dura mater. The sacculus is large 

 and rounded. The lagena (L) forms a 

 flattened not very prominent lobe, and 

 is of simple form. 



Urinary and Reproductive Sys- 

 tems. The kidneys (Figs. 920 and 921, 

 &.) are a pair of irregularly shaped, dark 

 red bodies, each consisting of two lobes, 

 anterior and posterior, situated in close 

 contact with the dorsal wall of the pos- 

 terior portion of the abdominal cavity, 

 and covered with peritoneum on their 

 ventral faces only. Their posterior por- 

 tions, which are tapering, are in close 

 contact with one another. Each has a 

 delicate duct, the ureter, opening pos- 

 teriorly into the cloaca. A urinary bladder 

 (&/.), a thin-walled sac, opens into the 

 cloaca on its ventral side. 



In the male the testcs (Fig. 920, t.) are 

 two oval white bodies, that on the right 

 side situated just posterior to the right 

 lobe of the liver, that on the left some- 

 what further back. Each testis is at- 

 tached to the body- wall by a fold of 

 the peritoneum, the mesorchium (ms. o.). 

 The epididymis (ep.) extends backwards, 

 from the inner side of each testis, and 

 passes behind into a narrower convoluted 

 tube, the vas defercns or spermiduct (v. d.), 

 which opens into the terminal part of 

 the corresponding ureter. A pair of 

 vascular eversible copulatory sacs (p,p f ), 

 which when everted are seen to be of 

 cylindrical form with a dilated and bifid 

 apex, open into the posterior part of the cloaca. 



In the female the ovaries (Fig. 921, or.) are a pair of irregularly 

 oval bodies having their surfaces raised up into rounded elevations. 



FIG. 



urinogenital 



920. Male 

 organs of Lacerta viridis. 



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 epididy- 

 mis is dissected away. II. 

 urinary bladder ; !>./;/, fold of 

 peritoneum supporting epi- 

 didymis ; cl.i anterior and 

 c?.- posterior divisions of the 

 cloaca ; ep. epididymis ; A 1 , 

 kidney ; ms. o. mesorchium ; 

 p, copulatory organs of which 

 the right is shown retracted 

 (2>') and the left everted (j?) ; 

 /. //^.retractor muscle of latter; 

 r. ridge separating .-interior 

 and posterior divisions of 

 cloaca ; n-t. rectum ; ret.' its 

 opening into the cloaca ; 1. 

 testis; u. ;/. urinogenital 

 papilla and aperture; v. <>. 

 vas deferens. (From Parker's 

 Zootomy.) 



