Brachiopoda

Diagrammatic section through an arm of the lophophore of Crania. 1, the lip; 2, the base of a tentacle bisected in the middle line; 3, great arm-sinus; 4, small arm-sinus, containing muscle-fibres; 5, tentacular canal; 6, external tentacular muscle; 7, tentacular blood-vessel arising from the cut arm-vesel in the small arm-sinus; 8, chief arm-nerve; 9, secondary arm-nerve; 10, under arm-nerve.

Keywords

Mollusca, braciopodas

Galleries

Brachiopods

Source

The Encyclopedia Britannica, Eleventh Edition (New York: The Encyclopedia Britannica Company, 1910)IV: 362

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