Mollusca
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A sub-kingdom of animals embracing a division of the invertebrates. It includes especially those having an unsegmented bilateral body; four nervecords arranged in pairs, two visceral and two pedal, with lateral and medial abdominal ganglia.
Galleries
Sea Urchins and Sea StarsSource
B. P. Holst The Teachers' and Pupils' Cyclopaedia (Kansas City: The Bufton Book Company, 1909)
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