As the chelae of Crustaceans resemble in some degree the avicularia of Polyzoa, both serving as pincers, it may be worth while to show that with the former a long series of serviceable gradations still exists.

由于甲壳动物的螯在某种程度上类似于多生动物的鸟骨，两者都起着钳子的作用， 因此可能值得证明前者还有一长串可用的等级。

The latter resembles somewhat more closely the chelae or pincers of Crustaceans; and Mr. Mivart might have adduced with equal appropriateness this resemblance as a special difficulty, or even their resemblance to the head and beak of a bird.

后者更类似于甲壳动物的螯或钳子；米瓦特先生可能会同样恰当地引用这种相似性作为一个特殊的困难，甚至他们与鸟的头部和喙的相似性。