Besides the avicularia, the polyzoa possess curious organs called vibracula.

除了鸟嘴骨外， 多栖动物还拥有被称为振动骨的奇怪器官。

Some species are provided with avicularia and vibracula, some with avicularia alone and a few with vibracula alone.

一些物种具有鸟骨和振动体， 一些仅具有鸟骨体， 少数仅具有振动体。

When a branch was placed on its face, the vibracula became entangled, and they made violent efforts to free themselves.

当一根树枝放在它的脸上时， 颤音就被缠住了， 它们拼命想挣脱。

In many cases the vibracula have a grooved support at the base, which seems to represent the fixed beak; though this support in some species is quite absent.

在许多情况下， 颤音的基部有一个带凹槽的支撑， 这似乎代表了固定的喙； 尽管在某些物种中完全没有这种支持。

In the avicularia and vibracula of the Polyzoa we have organs widely different in appearance developed from the same source; and with the vibracula we can understand how the successive gradations might have been of service.

在 Polyzoa 的鸟骨和颤骨中， 我们发现同一来源的器官在外观上大不相同；有了颤音，我们就可以理解连续的层次是如何发挥作用的。

The avicularia, like the vibracula, probably serve for defence, but they also catch and kill small living animals, which, it is believed, are afterwards swept by the currents within reach of the tentacula of the zooids.

avicularia 和 vibracula 一样， 可能起到防御作用， 但它们也捕捉并杀死活体小动物，据信，这些动物随后会在类动物的触手可触及的范围内被水流冲走。