Fossils of the Yorkshire Lias Described From Nature
Fossils of the Yorkshire Lias Described From Nature
M Simpson
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HUNTONI, Simp. Much depressed ; volutions three or four, inner ones three-quarters concealed, outer whorl one- half the diameter, gradually thinning to the keel ; radii sigmoidal, obsolete ; with distant deep con- strictions ; aperture acutely triangular ; diameter six-tenths of an inch. L. L. , ?/, E. H. Bay. This is easily confounded with the inner volutions of 120 A. Robinsoni, but it is more depressed, and the con- strictions are nearly straight. The shell is very thin, and faintly radiated... or striated. 148. A. ROBINSONI, Simp. Volutions four, inner ones nearly concealed, outer whorl more than one-half the diameter, back rounded ; radii slightly waving, nearly obsolete ; keel blunt ; aperture acutely triangular or ovate ; diameter seven-tenths of an inch. L. L. , 13. This beautiful little ammonite is from the lowest beds of Lias at Eobin Hood's Bay. The sides of the whorls are regularly convex, the inner margin is slightly ele- vated above the succeeding whorl; the keel is merely the thin edge of the back, which is rounded, but without the groove on each side, as occurs in A.
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