Description of two new land snails from the coal measures

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1872
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Abstract
IN the summer of 1869, I found that the concretionary limestone accompanying the underclay of coal No. 6 of the Wabash Valley section (see illinois Rep., iv, 254), at Pettys's Ford of the Little Vermilion river, below Georgetown, Vermilion county, TIlinois, contained numerous minute shells.(A small fragment of fish-bone is the only other fossil yet found in it.)A Pupa was readily recognized, and, from its outline alone, referred to P. vetusta Dawson.The other of the two species was doubtfully referred to Zonites.Later, in cleaning out the mouths of some individuals, a distinct tooth was found on the columella of the Pupa, and a broad lamellar extension of the columella of the so-called Zonites.The Pupa was evidently not P. vetusta j and the correction was sent to Prof. Worthen, but was overlooked when my report on the county was printed.Upon showing the so-called Zom'tes, in its cleaned condition, to Mr. F. B. Meek, he at once recognized it as congeneric with a minute species, Anomphalus rotulus, described by Meek and Worthen from Macoupin Co., Illinois (Proc.Phil.Acad., 1866, p. 268).They refer the genus to the Rotellidre: I am rather inclined to refer it to the Helicidre.I append descriptions and figures.Pupa VermilionensiS, n. sp., Fig. 1.Shell imperforate, spindle-shaped, tapering to an obtuse apex, covered with fine ridges (25 or 30 to the millimeter) parallel with the lines of growth.Aperture oblique, oval, rarely compressed.Outer lip thin, slightly reflexed.Columellar lip reflexed, thickened, furnished with a single central tooth projecting about
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Authors F. H. Bradley
Journal american journal of science
Year 1872
DOI
10.2475/ajs.s3-4.20.87
URL
https://ajsonline.org/article/65268.pdf
Keywords Keywords not found

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