SELF-FERTILIZATION IN CIONA. 319 



were well fertilized only with the a-sperm. The development of 

 the eggs as shown by the following table gave some unexpected 

 results when considered in the light of the number fertilized : 



TABLE V. Continued. 



A a A" Norm. A c Abn. A d o A e o A f Norm. 



B a Abn. B b B Norm. B d o B e o B f Norm. 



O Norm. C b Abn. C C d o C e o C f Abn. 



D a ? D b Abn. DC o D" D e o D f Abn. 



E ;i Abn. E b Abn. E Norm. E d o E e E f Abn. 



F a Norm. F b Norm. F c o F d o F e o F f 



The B a -tadpoles were abnormal although 100 per cent, of the 

 eggs were fertilized ; while the B c -tadpoles were exceptionally 

 normal. Although the c-sperm was very poor, the B and the E- 

 tadpoles were exceptionally active and normal. The E f -tadpoles 

 were only somewhat abnormal, although the eggs appear to have 

 been poor. The F a and the F b tadpoles were excellent, although 

 only 20 per cent, of the eggs divided in the latter case. 



TABLE VI. 



A a A 15 o A o A d 20 A e o A f o 



The most striking results shown by this table are that while 

 the F-eggs were excellent and the a-sperm also, yet F a gave 

 only one per cent, of segmenting eggs. The e and f-sperm gave 

 much better results with D-eggs, than did any other sperm with 

 these eggs, although some of the other sperm appears to have 



been excellent. 



TABLE VII. 



In this table also there are several cases where the sperm was 

 less capable with some eggs than with others, even when other 



