THE REPRODUCTIVE ORGANS 411 



(b) Fin Whales 



January. Twenty-two specimens. One of these was too rotten to be studied. Of the 

 remaining twenty-one, all except five had few spermatozoa. In two of these five 

 the spermatozoa could be described as numerous, and the tubules were well filled, 

 though not thickly packed with cells. In the third the spermatozoa were not numerous, 

 but seemed uniformly distributed along the tubules. In the fourth and fifth a number 

 of spermatozoa were present, but the tubules showed empty spaces or were loosely 

 filled with cells. In the remaining sixteen the testes all had few spermatozoa and the 

 tubules showed empty spaces or were loosely filled with cells. In spite of the one or 

 two exceptions the testes for January do not suggest much activity in this month. 



February. Thirty-five specimens. In two of these spermatozoa were comparatively 

 numerous, but the tubules, though well filled, were not thickly packed. There were 

 one or two cases where a moderate number of spermatozoa were present, but in the 

 great majority they were few and the tubules had empty spaces or were only loosely 

 filled with cells. 



March. Three specimens. One of these (early in March) had few spermatozoa. The 

 tubules, however, were distorted and it was difficult to interpret their condition. The 

 second (No. 114) at the end of March had fairly numerous spermatozoa. The tubules 

 were large and rather empty. The third specimen was rotten. 



April. Five specimens. One of these was hardly mature. Of the others spermatozoa 

 were very numerous only in one, but in all four the tubules were becoming thickly 

 packed with cells. In general, the sections for this month suggest that the activity of 

 the testes was well started. 



May. Three specimens. These three were all alike in the presence of very numerous 

 spermatozoa and tubules thickly packed with nuclei. 



June. No specimens. 



July. One specimen. Here again the spermatozoa were numerous and the tubules 

 thickly packed with nuclei. 



August. Four specimens. In these a moderate number of spermatozoa were present, 

 but the tubules were only loosely filled with cells. 



September. Five specimens. One had numerous and the other four from rather few 

 to moderate numbers with loosely packed tubules. 



October. Three specimens. There were rather few spermatozoa in all these. In two 

 cases the tubules were loosely filled with cells, and in the third they were practically 

 empty. 



November. Five specimens. In two of these (early in the month) there was a moderate 

 number of spermatozoa and the tubules were loosely packed with cells. In the other 

 three there were few spermatozoa and in two the tubules were rather empty. 



December. Three specimens. In one there was a moderate quantity of spermatozoa 

 but there were few in the other two. There was a tendency towards empty spaces in 

 the tubules of all three. 



