一种囊状的呼吸器官，见于蝎子和蜘蛛等蜘蛛类节肢动物，由象书的纸页一们平行排列着的膜状重叠物组成。
A sacculate respiratory organ found in some arachnids, such as scorpions and spiders, consisting of several parallel membranous folds arranged like the pages in a book.
哺乳动物只含有球囊和椭圆囊两种耳石器官，而非哺乳动物中还存在另外一种耳石器官——瓶状囊。
The macula lagena is another otolithic organ in the inner ear of non-mammals, and the lagena of more advaced birds develops better than that of lower animals.
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