( 400 ) 



The change following on this consists therein that the spermatic 

 tubes obtain a lumen and combine in one or two places (Didelpliys) 

 with the Wolffian duct gi'own into the testicle. In the epididymis 

 a great many cell cords have meanwhile appeared in the course of 

 the Wolffian duct (Vas epididymidis), out of which cell cords the 

 little tubules of the epididymis will develop. 



Of the Müllerian duct a rest has remained in the tissue of the 

 epididymis, I have not observed rests of this duct in the form of 

 hydatids. Neither did 1 find tiiem mentioned in literature. 



In the genital gland of the full grown animal I found that the 

 connection of the testicle and epididymis is formed by a mesorchium, 

 in which 'evidently a single tube forms tlie communication between 

 the two parts (Didelpliys, Halmaturus). Probably the same holds true 

 for Hypsiprymnus, where, according to Disselhorst ^), the epididymis 

 is a spindle shaped swelling in the course of the vas deferens. 



About the microscopic structure of the testicle and epididymis I found 

 in Disselhorst the communication that it agrees with that of other 

 animals. As on this immediatel_y follows: "die Spermatogenese war 

 in vollem (lange", it seems to me that this communication relates 

 more to the structure of epithets of the tubules than to the nature 

 of the connection of testicle and epididymis. 



A comparison witli what we tind in other mammals shows us the 

 following. 



There now and then is to be observed in the female sex (at least 

 in man) an excrescence of the cranial extremity of the Wolflian 

 duct, which then becomes the tnbo-|)a!"ovarian tube, which was first 

 described by Roth ■^) and recognised by Mihalkovics '') as a {)art of 

 the Wolffian duct. Where however in Marsupials the Wolffian duct 

 penetrates into the genital gland, the tubo-parovarian tube of man 

 remains in the Ligamentum latum. 



For the male sex the following holds true. 



A rete testis, whether it has to be considered as tubules, whicli 

 have appeared afterwards, and must be considered as a second 

 generation of tubuli seminiferi (Coert)'') or as homologa of the 



1) R. Disselhorst. Die mannliclien Geschlechtsorgane der iMonotremen und 

 einigei' Marsupialen. 



Semon's Zoölogische Forschungsreisen in Auslraliën und den Malayischen Archipel. 

 1904. p. 121. 



~) Quoted y^y Mihalkovics. 



^) Mihalkovics, Unlersuchungcn fiber die Enlwickelungsgeschiclite dcr Uro-genital- 

 organe der Craniolen. 



Internal. Zeitschrift fur Anatomie und Histologie. Bd. 2. 



^) Coert, Over de ontwikkeling der geslaclitsklier bij de z ogdieren. Diss. Leiden 

 1898. 



