avicularian

Thus with the avicularia of several species of Lepralia, the moveable mandible is so much produced and is so like a bristle, that the presence of the upper or fixed beak alone serves to determine even its avicularian nature.

VII. Miscellaneous Objections to the Theory of Natural Selection 1909

The vibracula may have been directly developed from the lips of the cells, without having passed through the avicularian stage; but it seems more probable that they have passed through this stage, as during the early stages of the transformation, the other parts of the cell with the included zooid could hardly have disappeared at once.

VII. Miscellaneous Objections to the Theory of Natural Selection 1909