Gasteropoda And Cephalopoda of the Raritan Clays And Greensand Marls of New ...

Cover Gasteropoda And Cephalopoda of the Raritan Clays And Greensand Marls of New ...
Gasteropoda And Cephalopoda of the Raritan Clays And Greensand Marls of New ...
Whitfield, Robert Parr, 1828-1910
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Not Murex Smithii Sow. : Mineral Conch., vol. 6, p. 151, tab. 578, Figs. 1-3.
Pyrula Smithii (Sow.) Conrad: Meek and others, when referred to as occurring in New Jersey.
Shell, as known from internal casts, short-pyriform, or shortly turbi- nate, with a rather low spire somewhat rapidly contracted below, forming a slender anterior beak of unknown length. Volutions in the cast not exceeding four in any of the specimens known, rather rapidly increasing in size and very ventricose, the upper surfa
...ce flattened nearly in the direc- tion of the very low spire, and seldom showing more than the slightest Digitized by Google 192 PALEONTOLOGY OF NEW JERSEY.
convexity between the sutures; below the periphery, which is more or less flattened, or but little convex, the volutions are rapidly and abruptly con- stricted to the moderately slender and somewhat lengthened anterior beak.
Aperture large, as wide as high when not compressed, contracted below into a narrow canal, as shown by the casts, and directed upward at the upper angle upon the preceeding volution; periphery of the volutions marked by a double row of tubercular or rounded nodes, those on the upper edge largest and most distinct; those below, situated at the point of contraction, being very much smaller and sometimes almost obsolete.


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