112 



3. In some cases the cranial part of the rete testis is connected 

 with the kidney by an efferent duct, which first passes through the 

 fatbodj. In one case a short side-duct, coming from the fatbody, 

 opened into such a duct. 



4. It was often observed that vasa efferentia, which run close 

 together, fuse. This fusion can take place near the testis as well as 

 near the kidney. 



5. In a few cases an efferent duct was found, which, originating 

 from the mesonephros, did not reach (he testis. 



6. The vasa efferentia between rete testis and mesonephros number 

 from four to nine, this agreeing with Ihe number, observed in adult 

 frogs. In the left and the right testis of the same animal the number 

 can vary. 



Utrecht, April 1922. Zoological Laboratoi^y, Veterinary College. 



LITERATURE CITED. 



Bremer, J. L. 1911. The morphology of the tubules of the human testis 

 and epididymis. Amer. Journ. of Anat., Vol. 11. 



De Burlet, H. M. und De Ruiter, H. J. 1920. Zur Entwicklung und Morpho- 

 logie des Saugerhodens. I. Der Hoden von M?<s wzmscm/ms. Anat. Hefte, Bd. 59. 



De Burlet, H. M. 1921. Zur Entwicklung und Morphologie des Sauger- 

 hodens. II. Marsupialier. Zeitschr. f. Anat. u. Entw., Bd. 61. 



Curtis, G. M. 1913. Reconstruction of a seminiferous tubule of the albino 

 mouse. Proc. Amer. Ass. of Anat. Anatomical Record, Vol. 7. 



1918. The morphology of the mammalian seminiferous tubule. Am. 



Journak of Anat., Vol. 24. 



Gaupp, E. 1904. Anatomie des Frosches. Ill Abt. Braunschweig. 



Huber, G. C. and Curtis, G. M. 1913. The morphology of the seminiferous 

 tubules of Mammalia. Anat. Record, Vol. 7. 



WiTSCHi, E. 1914. Experimentelle Untersuchungen iiber die Entwicklungs- 

 geschichte der Keimdriisen von Rana temporaria. Arch. f. Mikr. Anat., Bd. 85, 

 II. Abt. 



1921. Der Hermaphroditismus der Frösche und seine Bedeutung fur 



das Geschlechtsproblem und die Lehre von der inneren Sekretion der Keim- 

 drüsen. Arch. f. Entw. Mech., Bd. 49. 



ABBREVIATIONS. 



