A Comparative Study of the Area of Acute Vision in Vertebrates

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XXVIII, Fig. 35) and the guinea hen (Numida pucherani, PI. XXVIII, Fig. 36) it is shallow. In the last case the depression is so slight as to scarcely deserve the name of fovea. Chievitz mentions an area nasalis and a questionable fovea in the hen (Gallus doraesticus).
I have succeeded in finding only a very slight thickening.
Screech Owl (Megascops asio).
Barred Owl (Syrnium nebulosum).
These owls possess a single deep fovea surrounded by a sharply defined round area which differs from those j
...ust described only in position. It is located on the temporal side and above the nerve entrance in such a position as to function in binocular vision. The nerve entrance is similar in position to that of other birds, but the pecten is much smaller in pro- portion to the size of the eye (PI. XXIX, Fig. 55, and PI.
XXVII, Fig. 10).
Goose (Anser cinereus domesticus).
The goose possesses a shallow fovea nasalis surrounded by a round area situated on a band-like area extending horizontally through the retina.


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