154 NOTKS ON .M \l:>l ri AI.IAN ANATOMY, 



septum the approximation of the clitoris ou the cloacal 

 wall is cviclciit. ' Here and there small evanescent i;epta 

 arc formed as ingrowths of the clitoris ej)itlielivim. Erectile 

 tissue is i)rcsent in two curved bands round the ends of 

 the two septa. Outside these latter the vessels arc mainly 

 arranged in somewhat horseshoe-shaped masses. Ventral 

 to the vessels on either side of the ventral median septum 

 is abundance of nei've tissue. 



As the fusion of tlie two approximating cpithelia 

 continues, the clitoris sinks by degrees further and further 

 into the submucosa of the urogenital canal. As soon as 

 this is ccmplete, absoiption of the septum so formed takes 

 jilace, beginning at the upper end. the last remaining rem- 

 nants b^ing on the mid-ventral side. 



The general clitoris tissue and that of the urogenital 

 canal form now a homogeneous mass, except that the 

 clitoris is immediately recognisable by its vascularity. 



(Fig. 8). 



The erectile tissue here consists in section of two 

 lateral well-marked curved bands, separated in the mid- 

 line by a septum consisting of fibres crossing from the 

 upper to the lower sides of the outer fibrous sheath. This 

 septum is by no means continuous, but is interrupted at 

 intervals to allow the lateral portionsof the corpora cavern- 

 o.sa to communicate. (Fig. 9). 



The lateral portions of the clitoris, up till now the 

 most important, begin to lose their identity in the urogeni- 

 tal canal, and there is a corresponding increase in growth 

 of the central clitoa*is fold. The vessels of the lateral por- 

 tion Tiass into the main vessel of the central fold. This 

 fold now becomes longitudinally divided by a groove, 

 caudally shallow, but cranially deepening considerably. 

 Tho two portions of erectile tissue diverge considerably, 

 and sink deep into the wall of the urogenital canal. An- 

 teriorly they are found to end in the bulb-shaped swelling 

 jilustrated in Fig. 11. 



In sectioning the clitoris of a pouch ycung of b'ar- 

 cophilus, I find that a])ically the organ is comi^letely divid 

 ed by a septum. The sej)tum followed craniaily in sections 

 bifurcates, and thus divides the clitoris into three parts. 

 The lower ends of the two lateral s.^pta sc formed become 

 witlulrawn, and the arrangement is that shown in Fig. 10. 

 From this the adult structure is develoijcd. The arrange- 



