A 



B 



-fis 



FIG. 368. DIAGRAMMATIC LONGITUDINAL SECTIONS OF THE POSTERIOR PART OF 

 THE RECTUM, THE CLOACA, AND THE COPULATORY ORGANS OF VARIOUS 

 VERTEBRATES. (After Boas.) The relative positions of the ureter and vas 

 deferens are indicated although not situated in the median line. 



A, Crocodile ; B, hypothetical form between A and C ; C, Mono/rune (penis 



extruded) ; T), Monotreme (penis retracted). 

 '*/, connective tissue ; bl, urinary bladder ; d, cloaca ; d, rectum ; /, fibrous body 



(corpus cavernosum) ; h, ureter ; p*, sheath of penis ; pa 1 , aperture of the 



sheath ; r, seminal furrow or tube (penial urethra) ; x, vas deferens : //, 



urinogenital canal. 



