Palontology of the Upper Missouri a Report Upon Collections Made Principally
Palontology of the Upper Missouri a Report Upon Collections Made Principally
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Planorbella, HALDEMAN, ib. 1842.
? Gi/raulus, AGASSIZ, Nouv. MSm. Soc. Helv. I, 1837.
Planodlscus, STEIN, * * * 1843.
t Taphius, H. & A. ADAMS, Genera Recent Mol. II, 1856, 264.
Menetus, H. & A. ADAMS, ib. Ktym. Planus, flat ; orbis, an orb. Type. Helix cornea, LINN. SDS.
Shell dextral, or sinistrall 1 discoidal or subdiscoidal, the whorls being nearly or quite on the same plane; right side generally flat, or sometimes either a little elevated or concave ; left side more or less excavated ; vol...utions rounded, com- pressed, or angular; aperture crescentic or suboval, sometimes dilated; peristome thin, incomplete, right margin projecting.
The typical forms of this genus have the shell much depressed, and the volutions numerous, rounded or without angles, and visible on both sides ; while the mouth is not dilated. As above denned, however, it is made also to include several subor- dinate groups which depart more or less from the typical species, though generally placed here by conchologists.
What to read after Palontology of the Upper Missouri a Report Upon Collections Made Principally?
You can find similar books in the "Read Also" column, or choose other free books by F B Fielding Bradford Meek to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Planorbella, HALDEMAN, ib. 1842.
? Gi/raulus, AGASSIZ, Nouv. MSm. Soc. Helv. I, 1837.
Planodlscus, STEIN, * * * 1843.
t Taphius, H. & A. ADAMS, Genera Recent Mol. II, 1856, 264.
Menetus, H. & A. ADAMS, ib. Ktym. Planus, flat ; orbis, an orb. Type. Helix cornea, LINN. SDS.
Shell dextral, or sinistrall 1 discoidal or subdiscoidal, the whorls being nearly or quite on the same plane; right side generally flat, or sometimes either a little elevated or concave ; left side more or less excavated ; vol...utions rounded, com- pressed, or angular; aperture crescentic or suboval, sometimes dilated; peristome thin, incomplete, right margin projecting.
The typical forms of this genus have the shell much depressed, and the volutions numerous, rounded or without angles, and visible on both sides ; while the mouth is not dilated. As above denned, however, it is made also to include several subor- dinate groups which depart more or less from the typical species, though generally placed here by conchologists.
What to read after Palontology of the Upper Missouri a Report Upon Collections Made Principally?
You can find similar books in the "Read Also" column, or choose other free books by F B Fielding Bradford Meek to read onlineMoreLess
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