376 



COMPARATIVE ANATOMY 



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

 permanently within the abdomen. 



The testes ai-e smooth, and somewhat oval in form, and their 

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



ra:' 



Fig. 299.— Male Urinogenital Appakatus of the Hedgehog (Erhmam). 



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

 urinogenital tube ; Gpc, corpus cavernosum ; Pp, prepuce ; Op, glans penis ; 

 PD, preputial glands ; Gi1, Cowper'a glands ; Pr, Pr^, the different lolies of 

 the prostate ; Sh, vesicula seminalis ; ffo, testis ; Ep, epididymis ; Vd, VcP^ 

 vas deferens. 



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

 usually extend inwards. Thus the seminal tubules become 

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

 also formed (corpus Highmoi'i), through which the elements of 

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



