CHAIN OF CYCLOSALPA AFFINIS 403 
wheel portions of Chains VII and VIII. In all, the unbroken 
portions of seven chains were measured. . The number of zooids 
used depended upon the miminum size measurable. In four cases, 
90 zooids were taken but in the other three chains only 80, 70 and 
52 zooids respectively were large enough to be measured accurately. 
;.. [he measurements of all series are given but only two are plot- 
ted, the right-hand series of Chain II in fig. 1, and the right-hand 
s 3 13 AA BI ES 29 SS TT 9 4B OOD ee GS BD 
{ 
64 ie 
Z | | 
| | \ | 
56 Chain Il Right side. | | 
Upper line Length of 2o0/ds 
52 Dotted line Length of peduncles. _| 
Lower line Length of roof pieces freq 
48 4 IL 2) ss Se eee 
| erie 
44 | 
Fig. 1 Plot of length measurements of the zooids, peduncles, and foot-pieces 
of chain II, right series. Vertical distances represent length. Horizontal dis- 
tances represent position in the chain. 
series of Chain VII in fig. 2. In the latter figure, 1-90 are the 
zooids of the unbroken part of the chain while 91-108 are wheel 
zooids, the divisions between wheels being indicated by vertical 
dotted lines. Table 3 gives the measurements of zooids of several 
short chains of wheels which furnish figures for comparing graphs 
of wheels of various sizes. In each series of results here given 
except length of Chain I, two measurements were taken and these 
