107 



further towards tlie peri|)liery ; tiil)iile B f—ll (fig. 8) splits up 

 into two tubules towards the periphery (fig. 9), while B III is very 



Fié. 8. Section of the testis of an adult frog, about halfway the rete (X 50). 



Fig. 9. Section of the testis of an adult frog, near the periphery (X 50). 



short and ends blindly about halfway the periphery (fig. 10). If the 

 testis had developed further, this short tubule would probably have 

 grown peripherally. Tubule C divides into 5 parts. A, B and Care 

 connected with the rete close to each other. 



On comparing this testis with those, described above, we see that 

 apart from the size, there is no fundamental difference in the shape 

 of the tubules. The seminiferous tubules of the adult testis iiave the 

 same shape, but are longer and thicker. They form no anastomoses 

 and all end blindly. Most of them are strongly branched. The 

 tubules twist, especially near to the rete. Towards the periphery 

 the tubules are situated so close to each other that there is but a 



