668 
DAVID H. TENNENT 
Series I-V. Right anal mean, 2d day, 15.77. Increase on 3d 
day : decrease on 4th day ; increase on 5th day, 15.77, 16.07, 15.80, 
17.51. Variation increases with age. 
It will be noticed that Series II and IV differ from the others in 
their genera! behavior. Series II showing a steady growth through 
the period studied and Series IV showing a regular decrease in size. 
Series I, III and V, and the general population, represented by 
the combined Series I-V, agree in a different behavior, all indicat- 
ing the 4th day as a period of least change, followed by a period 
of growth. Series VI, the fed series, indicates somewhat the 
same behavior, with a slight drop on the 5th day. 
It is of interest, in this connection, to notice that the plutei 
in Series III which I checked off as individuals which would have 
gone through their metamorphosis, show the same behavior. I 
include a table of means of these individuals. 
Table 1 Selected individuals from Series III 
ANAL 
; ORAL 
R. 
L. 
R. 
L. 
18.54 
18.54 
13.27 
13.45 
20.00 
19.88 
16.58 
17.54 
20.81 
20.81 
17.59 
17.54 
24.54 
24.40 
20.48 
20.54 
2 days 
3 days 
4 days 
5 days 
