Dragons of the Air An Account of Extinct Flying Reptiles
The book Dragons of the Air An Account of Extinct Flying Reptiles was written by author Harry Govier Seeley Here you can read free online of Dragons of the Air An Account of Extinct Flying Reptiles book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Dragons of the Air An Account of Extinct Flying Reptiles a good or bad book?
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Secondly, the back of the head may be rounded convexly, both above and behind. That condition is seen in the short-tailed genera, such as Pterodactylus. But in the large Cretaceous types, such as Ornithocheirus and Ornithostoma, the superior longitudinal ridge which runs back in 70 DRAGONS OF THE AIR the middle line of the face becomes elevated and compressed from side to side at the back of the head as a narrow deep crest, prolonged backward over the neck vertebrae for some inches of length. A...ll these three types are paralleled more or less in birds which have the back of the head square like the Heron, or rounded like the Woodpecker; or crested, though the crest of the Cormorant is not quite identical with Ornithocheirus, being a distinct bone at the back of the head in the bird which never blends with the skull. In so far as the crest is reptilian it suggests the remarkable crest of the Chameleon. In the structure of the back of the skull the bones are a modification of the reptilian type of Hatteria in the Lias genus Campylognathus, but the reptilian characters appear to be lost in the less perfectly preserved skulls of Cretaceous genera.
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