PLATE 4 
EXPLANATION OF FIGURES 
17-19 Chain of Cyclosalpa affinis 
17 Ventral view of chain, showing unbroken part and four wheels. Somewhat 
diagramatic but drawn to scale. Natural size. 
18 Dorsal view of same. 
19 Peduncles of distal part of unbroken chain and of first two wheels. 
20 Peneroplis arietinus Batsch, sp. Longitudinal section through the shell. 
Taken from Brady, Foraminifera, Challenger Expedition, vol. 9, plate 138, fig. 22. 
21 Reophax membranaceus H. B. Brady. Taken from monograph of the For- 
aminifera of the North Pacific Ocean, Cushman, 1910, U.S. Nat. Museum Bulletin 
71, p. 90, fig. 126. 
22-25 Chain of Cyclosalpa affinis. 
22 Enlarged view of the distal foot-pieces of the unbroken part of the chain. 
23 Enlarged view of the foot-pieces of the first wheel. 
24 Diagramatic representation of three stages in the development of the cir- 
culatory system of the chain. 
25 Cross section through chain. 
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