The book A Manual of the Anatomy of Vertebrated Animals was written by author Huxley Thomas Henry Here you can read free online of A Manual of the Anatomy of Vertebrated Animals book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is A Manual of the Anatomy of Vertebrated Animals a good or bad book?
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The under-surface of the skull is rarely well exposed in its anterior part ; posteriorly, it exhibits a broad and long expansion, formed by the pterygoid bones, which unite in the middle line, and send processes outward and backward to the quadrate bone. On each side of the middle line of this region of the skull, is seen an ovoidal fossa or depression. The pterygoids are continued forward, and are united exter- nally with transverse bones, and more anteriorly with flattened palatine bones. Whe...n the fore-part of the under-surface of the skull is exposed, two other fossae are visible, one on each side of the middle line, bounded behind by the palatine bones, and separated by what appear to be the vomers. I conceive that these are the true posterior nares, and that the posterior aper- tures are simply spaces left between the pterygoid bones and the basis cranii. At the sides of the base of the skuU, specimens of Plesio- saurus occasionally exhibit two styliform bones, which lie parallel with the axis of the skull ; these may be parts of the 184 THE ANATOMY OF VERTEBRATED ANIMALS.
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