. The causes and course of organic evolution; . )ieces,the manubria. These seem to be represented in Limnceaby the oblique outer pieces of the unci with wliich they mayhave become fused. In prosobranch molluscs there are paired 524 Causes and Course of Organic Evolution jaws, which from their shape, position, and function probablyrepresent the incus completely separated into its halves. Alikein rotifers and molluscs these plates are protrusible from themouth, and act as triturating organs. inc unc man.

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