Edward T. Bkoavne 
95 
80 
4 6 6 7 8 9 10 11 12 13 14 15 
Number of Tentaculocysts 
Curve 1. 
Percentage curve showing the numerical variation in the tentaculocysts of 3000 adults taken in 
1898. (Table IV.) 
Comparison between the Smallest and Largest Adults. 
The measurement of the diameter of the umbrella of all the specimens was 
made in order that the variability of the smallest immature adults might be 
compared with that of the large mature ones. 
The specimens have been separated into four groups for comparison (Table V.). 
The percentage of variability is practically the same in the smallest (5 to 10 mm.) 
and the largest (.56 — 9.5 mm.) adults. Curve 2. The percentage of specimens 
with less than the normal number of tentaculocysts is almost the same in both 
groups and it therefore follows that that with the excess is also the same. 
It appears, then, that neither a decrease nor an increase in the number of 
tentaculocysts is injurious to the race, and that no selection is taking place in the 
young and adult stages in the number of tentaculocysts. 
