The book American Permian Vertebrates was written by author Samuel Wendell Williston Here you can read free online of American Permian Vertebrates book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is American Permian Vertebrates a good or bad book?
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The basisphenoid has its lateral processes considerably developed as keel-like elevations; anteriorly it is drawn out into a pointed, dagger-like parasphenoid, projecting into the space between the pterygoids. The anterior wing of the pterygoid is, at the beginning, gently emarginate, forming the interval for the parasphenoid, but it soon unites with the corresponding wing of the opposite side. The extent of the united ptery- goids in front is considerable, though how great cannot be said becau...se of the imperfect preservation of the specimen. The posterior process of the ptery- goids extends dorsalward in the region of the quadrate, forming on one side the border of the inferior temporal vacuity, on the other taking part in the formation of the otic notch. On the margins of the anterior processes of the pterygoid which form the interpterygoid vacuity, as also on the elevation, there are traces of small teeth; but the preservation of the specimen does not permit the determination of the number.
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