. Carnegie Institution of Washington publication. FOSSIL TURTLES OF NORTH AMERICA. The midline behind the premaxillae is occupied by the single vomer. Anteriorly it divides the nasal passages from each other; laterally it articulates with the palatines; posteriorly, with the pterygoids. The palatines assist in roofing the nasal passages and in forming the triturating surface mentioned. Between each and the maxilla of its side is seen an opening, the posterior palatine foramen. The pterygoids meet each other at the midline anteriorly, but posteriorly are separated by the basisphenoid. They exte
. Carnegie Institution of Washington publication. FOSSIL TURTLES OF NORTH AMERICA. The midline behind the premaxillae is occupied by the single vomer. Anteriorly it divides the nasal passages from each other; laterally it articulates with the palatines; posteriorly, with the pterygoids. The palatines assist in roofing the nasal passages and in forming the triturating surface mentioned. Between each and the maxilla of its side is seen an opening, the posterior palatine foramen. The pterygoids meet each other at the midline anteriorly, but posteriorly are separated by the basisphenoid. They extend backward so far as to exclude the bone last mentioned from contact with the quadrates. The lateral border of each pterygoid is mostly a sharp free edge. Behind the basisphenoid comes the basioccipi- tal. It is joined on each side by the exoccipital, and all three of these bones join in forming the occipital condyle. From this view is seen also a portion of the par- occipital and squamosal. On each side of the basicranial axis are seen foramina for the passage of various nerves and blood-vessels. Each ramus of the lower jaw is composed of six bones. In front is the dentary, furnishing the triturating surface of the jaw, covered above with a horny sheath, and ..pmx 3-. 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 Carnegie Institution of Washington. Washington, Carnegie Institution of Washington
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