Synopses & Reviews
Synopsis
Excerpt from The Nautilus, Vol. 25: The Cardinal Teeth of Pisidium; May, 1911
In young, and even many half-grown specimens, there is plainly a single cardinal tooth, strongly curved. With advancing age there appears an indentation in the middle (above), as the anterior and posterior parts are growing more. They grow also in thickness, even the thinner anterior often becomes grooved, and at the same time the whole tooth becomes more curved, resp. Angular, resembling the two in the left valve (inversely). But a careful examination will show that the two shanks are connected.
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