. Revision of the land snails of the Paleozoic era, with descriptions of new species [microform]. Gasteropda; Mollusks; Gasteropodes; Mollusques. laifs. J. W. DawsonâPaleozoic Land Snails. 413 not determinaSra?i«c[ of Morse, with the living species minuscitla and exigua. Pupa vetuafa. ^t\io\xg\it it best, however, to place it in the subgenus Conulus nitted to the 1 ithe genus Zoniles, as defined by Messrs. Adams. With was named siiii'd to the subgeneric name, Dr. Carpenter explained that ave been suHieubgenus Conulus of Fitz, 1883, appears to be synonymous vetusta in »rc«A Trochiscns Held,
. Revision of the land snails of the Paleozoic era, with descriptions of new species [microform]. Gasteropda; Mollusks; Gasteropodes; Mollusques. laifs. J. W. DawsonâPaleozoic Land Snails. 413 not determinaSra?i«c[ of Morse, with the living species minuscitla and exigua. Pupa vetuafa. ^t\io\xg\it it best, however, to place it in the subgenus Conulus nitted to the 1 ithe genus Zoniles, as defined by Messrs. Adams. With was named siiii'd to the subgeneric name, Dr. Carpenter explained that ave been suHieubgenus Conulus of Fitz, 1883, appears to be synonymous vetusta in »rc«A Trochiscns Held, 1837 (non Sby.); also with Petasia Beck, ison. This nfi^ 'â > and with Perforatella Schliitt.; and according to Adams liabitat or nif i subgenus of Zonites Montf. (non Leach, Gray). Those I in the do not care to enter into these subgeneric distinctions, served that '1^ designate the species as a Zonites, or even, speaking loosely, ipa vetusta, ^ Helix. There seems nothing in its characters to separate ,'4nore than specifically, from many of our smaller helicoid Udls with thin shells and simple aperture. 5. Dawsonella Meeki Bradley. (Figs. 12 and 13.) rSeport of Geological Survey of Illinois, vol. iv, p. 254. Am. Joura. of Sci., Ill, >tlv, p. 88. Ibid, vol. vii, p. 157.] pescription.*âShell broad, depressed, helicoid. Spire ob- J8,|<'%^o/rema) monodon. lensis; (d) Zonv F*^'' specimens of this shell I am indebted to the persons tlian^etora. fc^,,jJh!y Dr. Carpe ««>«"***⢠Fer. "oil ' i>i ^' >^^^^P^*^^^^^ (franda^va, s. n. (Fig. 15.) ipared it wit l^escription.âShell cylindrical, with obtuse apex. Whorls d under_[/^vf faip* or more. Surface covered with sharp vertical ridges, :| * Modified from Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Da
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