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vein leaves the cranial cavity through the foramen magnum. A very characteristic feature of Sphenodon is the development of large sinuses resembling those of the crocodile, but these communicate with the extracranial vascular system in quite a different manner from that described by Rathke in the latter animal. Variations in Pressuredoi:10.1098/rspb.1909.0026 fatcat:h2v4qkrfcbaydl3vs52w7kfgbm