CASTLE: EMBRYOLOGY OF CIONA INTESTINALIS. 207 
TABLE I.— Crosg FERTILIZATION. 
Lot A. Lot B. 
4 As ms 
Total 
Day. Ast. 2d. 9d. | 4th. | 5th. | 6th. of 
Cases. 
909, fertilized 2 2 
25% fertilized 1 1 2 
10% fertilized 1 H 1 8 
5% fertilized 1 1 3 
4% fertilized 1 1 
None fertilized 8 T 7 7 8 10 47 
No eggs laid 1 1 [2] 
Total 58 
[60] 
Average fertility = 4.8%. 
TABLE Il. — Cross FERTILIZATION. 
Lot B. Lot A. 
us - — a : —— — — 
Total 
Day. lat. 2d. 9d. | 4th. | 5th. | 6th. of 
Cases, 
100 % fertilized 5 4 4 5 5 5 28 
20% fertilized 1 1 
None fertilized 1 1 
Total 30 
Average fertility = 94%. 
