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Heart of the Mollusca
Heart of the Mollusca Diagram to show the relations of the heart in the Mollusca (From Gegenbaur.) A, Part of the dorsal vascular trunk and transverse trunks of a worm. B, Ventricle and airicles of Nautilus. C, Of a Lamellibranch, of Chiton, or of Liligo. D, Of Octopus. E, Of a Gastropod. a, Auricle. v, Ventricle. ac, Arteria=cephalica=(aorta). ai, Arteria abdominalis. The arrows show the direction of the blood-current.
Source: 1911 Encyclopedia Britannica, Vol. 5, p. 691
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River Plate Dolphin
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Eyes of Mollusca
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Callichthys armatus : Callichthys armatus, a cat-fish from the upper Amazons.

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Loricaria lanceolata : Loricaria lanceolata, a cat-fish from the upper Amazons.

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Malopterurus electricus : The electric cat- or sheath-fishes (Malopturus) are externally at once recognized by the absence of a rayed forsal fin, of which only a rudiment remains as a small interneural spine concealed below the skin. The entire fsh is covered with soft, villose skin, an osseous defensive armour having become unnecessary in consequence of the developme...

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(Script last modified Thursday, the 29th of July, 2010 at 5:27am)