EXCRETORY SYSTEM Oiq 



Table IX. and Fig. 473 show in summary form the dis- 

 tribution of types of kidney in the vertebrates. 



TABLE IX 

 The Kidney in Gnathostomes 



i.o.d. 



vn.-: 



TfTV. 



hi.--^ 



jrj(3^ ^7y._The urinary and genital organs of a lizard {Lacerta). 



A, Male; B, female. 



hi Bladder • cl cloaca ; epd., epididymis ; i.o.d., internal opening of the oviduct ; im., iloum : *. k.dney ; 

 ' c.roviduct o?. external opening of oviduct ; ov., ovary ; pn., penes ; r.p retractor muscles of the 

 penes ;rm! rectum ; U, testes ; «g . urinogenital opening ; ur.. ureter ; «r'.. openmg of uret«r ; v.d., 

 vas deferens 



