Cutting the frenula caused the pedalia to contract but seemed not to affect the ability to swim.
No evidence is given that the frenula or the velarium can impart their contractions to other tissue, though this seems probable for the former.
The piece in which he did get contractions he suspects may have been intimately associated with some part of the frenula or the suspensoria.
Small pieces cut from between the pedalium corners and the frenula, so as to have tissue on them from neither, could contract by themselves.
Cutting the frenula seemed not to affect the ability to swim well.
Underlying the epithelium of the frenula and the suspensoria are ganglion cells and nerve fibers in larger numbers than elsewhere (excepting the ganglia mentioned) in the subumbrella.
