from The Century Dictionary.
- A class of animals connecting the molluscoid invertebrates with the Vertebrata; the tunicates, tunicaries, or sea-squirts, otherwise called Tunicata, Ascozoa, Urochorda, or Protovertebrata (in part); the ascidians.
- [Used as a singular.] Less proper form of
- [lowercase] Plural of
Sorry, no etymologies found.
If the animal be opened, it is found to have, in the first place, a tendinous membrane running round inside the shell-like substance, and within this membrane is the flesh-like substance of the ascidian, not resembling that in other molluscs; but this flesh, to which I now allude, is the same in all ascidia.
In Chap. II, § 1 and § 2 we have already referred to the value which Darwin, and more especially Häckel, lays on the relationship of the larva of the ascidia to the lancelet fish.
Some of the ascidia or pitcher-like formations are due to the cohesion of the margins of two leaves, as in a specimen of _C.assula arborescens_, observed by C. Morren.
Paris quadrifolia var. Besides the above varieties of ascidia formed from the union of one or more leaves, there are others which seem to be the result of a peculiar excrescence or hypertrophy of the leaf.
In addition to other publications previously mentioned, reference may be made to the following treatises on the subject of ascidia: -- Bonnet, 'Rech.
Rare instances point  to poor races, but the magnolias and lime-trees are often so productive of ascidia as to suggest the idea of ever-sporting varieties.
The first bore one small pitcher-like blade, the second and third, each one highly modified organ, the fourth, two ascidia, and the last, one leaflet with slightly connate margins.
All in all, the tendency to produce ascidia increased from the beginning to the tenth leaf, and decreased from this upward.
Pitchers or ascidia, formed by the union of the margins of a leaf, are perhaps the best proof.
As far as we can judge peltate anomalies are quite uninjurious, while ascidia are forms which must impede the effect of the light on the leaf, as they conceal quite an important part of the upper surface.