Rattlesnake Skull
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This illustration shows the skull of a rattlesnake. ar, articular portion of lower jaw; de, dentary portion; bo, basi-occipatal; mx, maxilla, bearing poison fang; na, nasal; pl, palatine, the front end being represented by a dotted line as though seen through the maxilla; pmx, premaxilla; po, post frontal; pr, prefrontal; pt, pterygoid; qu, quadrate; sq, squamosal; tr, transverse bone.
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Reptile AnatomySource
Thomas Walton Galloway, Zoology A Text-Book For Secondary Schools, Normal Schools and Colleges (Philadelphia: P. Plakiston's Son & Co., 1913) 383
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