CHAIN OF CYCLOSALPA AFFINIS A15 
shove out and turn. The sketch of the deploying point will make 
this clearer. Figs. 14, 15 and 16 are dorsal, lateral and ventral, 
views of the deploying point of one chain. These drawings were 
outlined with the aid of the camera and much care was taken to 
make them accurate.’ 
Calling the zooid whose oral end has just begun to shift, no. 1, 
the aboral ends of nos. 8 and 9 (numbering on one side only) are 
beginning to do the same. No. 25 (not shown in the figure) 
seems to have reached the final position with the rearrangement 
of the internal organs complete. We find now that the right 
sides of the right-hand zooids (considering those to be right-hand 
zooids that correspond to the right-hand side of the parent) and 
the left sides of the left-hand zooids are toward the base of the 
stolon. This statement applies to the chain before it emerges 
from the parent. The orientation of the older, extruded part of 
the chain is given later. 
All of the observations on the early growth and differentiation 
of the chain agree with those made by Brooks for C. pinnata with 
the exception of the orientation. Brooks (’93 p. 79) says of the 
single file zooids: 
At this stage each Salpa is bilaterally symmetrical, and its plane of 
symmetry is the same as that of the stolon, while its long axis is at right 
angles to that of the stolon, which becomes converted into a single row 
of Salpae, so placed that the dorsal surfaces of all of them are toward 
the base of the stolon, their ventral surfaces towards its tip, their right 
and left sides on its right and left respectively, their oral ends at its top 
or neural side, and their aboral ends at its bottom or genital side. 
Again in his description of the double row he says: 
The single row of Salpae becomes converted into a double row, which 
consists of a series of right-handed Salpae and aseries of left-handed ones, 
placed with. . . . the left sides of those on the right and the right 
sides of those on left towards the base of the stolon. 
*The loop-like structures seen at the oral extremity of the zooids in figs. 
14 and 15 might easily be mistaken for the intestine. They are not this struc- 
ture, but indicate very nearly where the oral orifice will appear. 
