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- noun Plural form of
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[PLICATULA MARGINATA] Shell strong and thick, but rather small; valves sub-equal, ovate, wedge-form, with three strong radiating plicae.
Their section is circular with an inner pair of opposed carinae; and their surface is subdivided into numerous narrow planes and provided with a few vertical interrupted plicae, which are more numerous internally.
[GALEODIA HODGII] Shell rather thick; elliptical, obtuse; whirls about five, inflated, and ornamented with numerous fine spiral lines, which are quite prominent at base; these, with the fine lines of growth, give the surface a cancellated appearance; collumellar lip marked with many irregular plicae; aperture nearly twice the length of the spire.
From the teeth of Mososaurus those of Pliogonodon differ in their narrower proportion, their straightness, their circular transverse section, their relatively narrower planes, and in their possession of plicae.
I left them hastily somewhere in the area of the mucous membrane of the small intestine ( "including that of the plicae circulares") and reverting to my rapidly proliferating list, journeyed back more than 1,360 tempting pages to chorion, only to find myself and it deeply involved with the fetus of mammals.