109 



they show the following paiticuliaiilies and diflfeiences, skelciied 

 schematically in fig. 11 a—f; testes, corpora adiposa and kidney 

 are dotted, while rete testis and vasa efFerentia are black. Forsinn- 

 plicity's sake all the ducts are indicated by successive numbers. 



Fig. lln gives a schema of the right testis of a frog, measuring 

 2.8 cm. in length. From the testis lo the mesonephros 4 efiferent 

 ducts run, of wiiich the two last have fused over some distance. 

 At the cranial side of the testis there is also a vas efferens (N°. 2), 

 but this one is not connected with the mesonephros. It runs cranial- 

 ward and ends in the fat body. Still more in front of the fat 

 body there is a very short vas efferens, connected neither with the 

 testis nor with the kidney. 



In fig. l\h a schema of the left testis of the same juvenile frog, 

 with 10 efferent ducts is reproduced. The most cranial one, running 

 only over a short distance in the fat body, can be compared to the 

 first vas efferens of the right testis of the same frog. The rete testis 

 is connected by 8 different vasa efferentia (N"« 2—9) with the 

 mesonephros. N^^ 5 and 6 arise from the rete at some distance from 

 each other, but quite near to the testis-surface they come close 

 together and run parallel without fusing, however, to the mesone- 

 phros. The two ducts (N'J« 8 and 9) at the caudal side of the testis 

 arise close to each other but separately, from the testis, and unite 

 just outside the testis to form a common duct. As is the case in 

 the testis described above (p. 8) and sketched in fig. 5, the 10^'' vas 

 efferens is not connected with the rete testis. Only a few semini- 

 ferous tubules open into this duct; so these are directly connected 

 with the kidney. 



The two testes sketched in fig. \\c and \ld belonged to a frog, 

 also measuring 2.8 cm. in length. In both the most cranial efferent 

 ducts have no direct connection with the mesonephros, but run 

 cranialward to the fat-body and from here to the kidney. In the 

 right testis, behind this efferent duct, there are still six others, from 

 which N"* 3 and 4 are only separated over a short distance, quite 

 near to the kidney. 



In the left testis of the same animal the 2^ and 3'^ vasa efferentia 

 arise separately from the rete; they fuse near the mesonephros to 

 form a common duct. The caudal vasa efferentia, N"^ 5 and 6, run 

 parallel in the testis and unite there, where they leave the testis; 

 then I hey split, subsequently they again form one duct and finally 

 they enter the kidney separately. 



The right testis of the specimen, the last to be described (3 cm. 

 in length), shows only one peculiarity (fig. lid) i.e. the 3"^ and 4^^ 



