Zool. [mod.L.; see SUB- 1 f.] The internal ventral or oral disk of a hydrozoan; the concave muscular layer beneath the umbrella of a jelly-fish.
1878. Bell, trans. Gegenbaur’s Comp. Anat., 108. In the Medusæ it [sc. a muscular layer] is limited to the surface which carries the gastric apparatus, where it forms the ‘sub-umbrella.’
1898. Rolleston & Jackson, Anim. Life, 248. Scattered ganglion cells in connection with this [inner nerve] ring lie in the ectoderm of the sub-umbrella.
Hence Subumbrellar a. [SUB- 1 b], beneath the umbrella; pertaining to the subumbrella.
1877. Huxley, Anat. Inv. Anim., iii. 137. A sub-umbrellar cavity with a roof formed by the umbrella.
