264 COMPARATIVE ANATOMY AND PHYSIOLOGY. 



Fig. 110. Renal and Generative Organs of 

 Ericulus setosus. 



course ; thus in 

 Gymnura they 

 open into, and in 

 Ericulusnear, the 

 neck (Fig. 110) ; 

 in man they enter 

 the walls of the 

 bladder at its 

 base, but run in 

 its walls for 

 about three- 

 quarters of an 

 inch before open 

 ing into the ca- 

 vity of the blad- 

 der ; in the rab- 

 bit they open far 

 up on the hind 

 wall, and in the 

 coney at the top. 

 The bladder itself 

 varies consider- 

 ably in size and 

 form ; when, as 

 in the higher 

 forms, the cloaca 

 disappears, the 

 urino-genital ori- 

 fice is in front of 

 the anus. (See 

 page 170.) 



r. Kidneys; /, testes ; 

 ut, ureter ; rd, vas 

 deferens ; b, bladder ; 

 pg, prostate glnnd; 

 eg, Cowper's gland ; 

 lp, levator penis; cc, 

 cystic urethra; pr. 

 prepuce, divided and 

 reflected ; p, penis. 

 (AJter Dobsou.) 



