Manual of Conchology; Structural And Systematic. With Illustrations of the Species. Second Series: Pulmonata

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Manual of Conchology; Structural And Systematic. With Illustrations of the Species. Second Series: Pulmonata
George Washington Tryon
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Polydontes Montf., Conch, Syst. ii, p. 154, and of authors.
This section seems to be much more closely allied to Thelidomus and especially Parthena than to Caracolus, and should have been placed in the preceding group. I now place it here because it was omitted in the synopsis of sections on p. 56. The animal has not been observed.
Key to species of Polydontes.
Peristome toothed within, imperator.
Peristome not toothed, Periphery strongly carinated, apoUo, Periphery very obtusely carinated or r
...ounded, sobrina.
H. IMPERATOR Montfort. PI. 9, figs. 80-83, 87.
Imperforate or narrowly umbilicate, depressed, heavy, thick, solid, opaque, nearly lusterless, yellow, densely obliquely streaked with light chestnut, and with very numerous but inconspicuous spiral lines of the same above ; surface with rather coarse irregular wrinkles of increment, and under a lens seen to be covered with an -excessively minute decussated sculpture; spire low-conical ; whorls 5 ; body-whorl depressed, carinated, a trifle descending anteriorly ; aperture oblique, bluish-white within ; peristome flesh-colored, very heavy and thick, expanded, its face convex, bearing on the inner margin numerous tubercular teeth ; umbilicus closed by the ex- panded baso-columellar lip or open ; parietal wall bearing a heavy callus.


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