North of that river the parallel chains of the Jura form an arc of a circle with its convexity towards the north-west. [Please select]
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Facial tubercle: Diptera; a median convexity below middle of face. [Please select]
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The usual dorso-median lobe is lacking but its position is indicated by a gently rounded convexity. [Please select]
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If a person's sight is thus corrected for distant objects, he can still see near objects quite plainly, as the lens will accommodate its convexity for them. [Please select]
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