376 



COMPARATIVE ANATOMY 



ever (e.g., Monotremes, most Edentates, Elephant), the testes remain 

 permanently within the abdomen. 



The testes are smooth, and somewhat oval in form, and their 

 relative size varies in different Mammals ; they are covered by a 



FIG. 299. MALE UBINOOENITAL APPARATUS OF THE HEDGEHOG (Erinaceus).. 



N, kidney ; Ur, ureters ; B, urinary bladder ; Pm, membranous portion of 

 urinogenital tube ; Cpc, corpus cavernosum ; Pp, prepuce ; Gp, glans penis ; 

 PD, preputial glands ; Cd, Cowper's glands ; Pr, Pr l , the different lobes of 

 the prostate ; Sb, vesicula seminalis ; Ho, testis ; Ep, epididymis ; Vd, Vd^y. 

 vas deferens. 



fibrous investment (Fig. 300), from which processes (trabeculse) 

 usually extend inwards. Thus the seminal tubules become 

 separated into definite lobed masses, and a sort of lattice-work is 

 also formed (corpus Highmori), through which the elements of 

 the vasa efferentia pass to the epididymis. In the latter the 



