THE SEI WHALE 241 



The data in Table XVIII cannot be said to indicate any definite season of activity 

 in the male sexual cycle, during February, March and April at least. In the majority 

 of the testes, sections show the tubules well filled with cells, many of them in various 

 stages of division, but few spermatozoa are present. On the other hand, smears from 

 testis and epididymis give interesting results when compared with sections. In two 

 cases sections showed the tubules with large spaces practically empty of cells, but 



Tola I Length in metres 



Fig. 68. Sei whale. Males. Volume of testis. 



smears showed that the epididymis contained many spermatozoa. In no case were 

 spermatozoa numerous in the epididymis in whales in which the testis tubules were 

 full of cells and apparently in full activity. 



Only four specimens were examined during July, August and September ; in three 

 of them spermatozoa were present in fair numbers or large quantities, while in the 

 fourth, though none were present in the testis, by analogy with whales Nos. 3270 and 



