Rhopalium Definition

Rhopalium Sentence Examples

• At the apex of the rhopalium the endoderm is greatly thickened and consists of concrementcells secreting otoliths (Con).

• The more proximal portion of the rhopalium usually bears one or more ocelli (oc).

• The rhopalia are lodged in the notches be tween the marginal lobes of the umbrella, and each rhopalium is covered over by a little protecting flap or lappet.

• Each rhopalium is a centre round which, as already stated, nervous tissue is concentrated.

• In Aurelia there are two on each rhopalium, a simple ocellus on the exumbral side, and a cupped ocellus on the subumbral side (not present in young individuals).