Identifier: monographyoffami1212conr (
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Monography of the family Unionidæ : or, Naiades of Lamarck (fresh water bivalve shells) of North America ...Year:
1836 (
1830s)Authors:
Conrad, T. A. (Timothy Abbott), 1803-1877Subjects:
Unionidae MollusksPublisher:
Philadelphia : J. DobsonContributing Library:
Smithsonian LibrariesDigitizing Sponsor:
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view book online to see this illustration in context in a browseable online version of this book.Text Appearing Before Image:111. ■.>•, Raj. o , ol.iatus, HlldrethText Appearing After Image:UNIO PHILLIPSII. Plate V.—Fig. 1.DESCRIPTION. Shell subovate, with concentric furrows; anteriorside smooth; disk with a single row of irregulartubercles in the centre, some of which are elongatedand grooved; posterior side narrowed, with a widefurrow and a few small tubercles; umbonial slopestraight, carinated and tuberculated; posterior slopeconcave, indistinctly tuberculated; ligament sloperectilinear, oblique; extremity direct, emarginate;basal margin swelling centrally, emarginate behind;umbo prominent, rather broad, flattened at the sum-mit; beaks retuse; epidermis yellowish-brown, withindistinct filiform rays over the umbo; within white;cardinal teeth rather small, direct, double in eachvalve. OBSERVATIONS. This handsome species is allied to U. quadrulus,Raf., but is very distinct, the young shell havingbroad smooth and retuse beaks, whilst the young ofthe qaadrulus has the beaks narrowed, tuberculated,pointed and curved forwards. The specimen figuredis from the Wabash, and isNote About Images 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 work.