Carpenter, William Benjamin, 1813-1885 · Philadelphia : Blakiston · leaf 772
thecephalic portion (i); next, this border is fringed with short cilia,and the cephalic extension into two lobes begins to show itself;and then between the lobes a large mouth is formed, openingthrough a short, wide oesophagus, the interior of which is ciliated,into the visceral cavity, occupied as… … B
Microscopy · Biology
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