5. _Hexamita inflata_, Duj.(_Distomatidae_); normal adult.
6, 7 _Salpingoeca urceolata_, S Kent (_Choanoflagellata_)--6, with
collar extended; 7, with collar retracted within the stalked cup.
Encyclopaedia Britannica, 11th Edition, "Finland" to "Fleury, Andre" Volume 10, Slice 4 · 第 41 / 53 题