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" ... manner that the apex of the tooth describes the arc of a circle, and finally points downward instead of backward. This protrusion of the fang is not an automatic motion, consequent upon mere opening of the mouth, as formerly supposed, but a volitional... "
Proceedings - Page 355
by Nebraska. State Board of Agriculture - 1892
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Bulletin of the United States Geological and Geographical ..., Volume 4, Issue 1

Geological and Geographical Survey of the Territories (U.S.) - 1878
...the apex of the tooth describes the arc of a circle, and finally points downward instead of backward. This protrusion of the fang is not an automatic motion,...folding back is accomplished by the ectopterygoid and spheuo palatine muscles, which, arising from the skull behind as a fixed point of action, in contracting...
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Bulletin of the United States Geological and Geographical Survey ..., Volume 4

Geological and Geographical Survey of the Territories (U.S.) - 1878
...the apex of the tooth describes the arc of a circle, and finally points downward instead of backward. This protrusion of the fang is not an automatic motion,...the tooth, also is; so that, in simply feeding, the tangs are not erected. The folding back Is accomplished by the ectopterygoid and spheuo-palatine muscles,...
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Bulletin of the United States Geological and Geographical Survey ..., Volume 4

1878
...the apex of the tooth describes the arc of a circle, and finally points downward instead of backward. This protrusion of the fang is not an automatic motion, consequent upon mere opening of the mouth, ˇis formerly supposed, but a volitional act, as the reverse motion, namely, the folding back of the...
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Snakes: Curiosities and Wonders of Serpent Life

Catherine Cooper Hopley - 1882 - 614 pages
...downward instead of backward. This protrusion of the fang is not an automatic motion, consequent upon the mere opening of the mouth, as formerly supposed, but a volitional act, as the reverse motion, viz. the folding back of the fang, also is ; so that in simply feeding the fangs are not erected.'...
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Snakes: Curiosities and Wonders of Serpent Life

Catherine Cooper Hopley - 1882 - 614 pages
...apex oŁ the tooth describes the arc of a circle, and finally points downward instead of backward. This protrusion of the fang is not an automatic motion, consequent upon the mere opening of the mouth, as formerly supposed, but a volitional act, as the reverse motion, viz....
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The Reptiles of Western North America: An Account of the ..., Issue 10, Part 2

John Van Denburgh - 1890 - 1028 pages
...the apex of the tooth describes the arc of a arde, and finally points downward instead of backward. This protrusion of the fang is not an automatic motion,...mere opening of the mouth, as formerly supposed, but • volitional act, as the reverse motion, namely, the folding back of the tooth, also is; so that,...
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