Ascidioidea,
n. pl. [NL., fr.
ascidium +
-oid. See
Ascidium.].
A group of Tunicata, often shaped like a two-necked bottle. The group includes, social, and compound species. The gill is a netlike structure within the oral aperture. The integument is usually leathery in texture. See Illustration in Appendix. [1913 Webster]