CHAIN OF CYCLOSALPA AFFINIS 411 
Chain IV, whose plot of differences is shown in fig. 4, is one of 
the smaller chains and in it one would expect to find the grouping 
less evident than in the larger chains. However it can be plainly 
seen even here. The right and left sides of Chain VI are shown in 
fig.5. With Chains IV and VI, the differences were figured only 
for the zooids 45-90. In figs 6 and 7, the two sides of Chain VII 
46 50 A 
7 Passee See 
jana e rt a 
20 Flot of Differences feu ae 
ra A oe ci aks i SUR nee 
a Lower series-.. /-45 fp 
8 || iy A 
jae a Fr a eee 
ol EY aes 
ry liad ioe oe Ud ala cual 
“EE I EVA fl 
aloe Bae aco 
-(.6 
7AM GicaGte WNC i 
24 ee ~ | 
eo ale ahaa Le PP L 
ce Sa | 
aa fe a ee 
= inal a a a ee Jee SS -| 
Jn eS aaa Aca aS pee 
JS cies AM oS a ele il a 
(2S 2 cansansa a 
2 6 10 14 18 t2 26 30 4K 36 42 46 
Fig. 6 Plot of differences for chain VII, left side 
are given entire, the curves and the differences being figured 
separately for the two parts of the chain, since it can be fitted 
better when but half is considered at one time. The complete 
series being given, one can more readily see how the amplitude of 
the waves increases toward the end. 
It will be remembered that in computing the differences, the 
observed values were subtracted from the calculated values. 
Hence upward curves in fig. 2 appear as downward curves in fig. 7. 
To make the comparison with the wheel graphs easier the signs 
JOURNAL OF MORPHOLOGY, VOL. 22, NO. 2 
