REPTILES 



Figs. 449 to 451. — The Chelonian Retina. 



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Fig. 449. — The retina of the tortoise ( x 200) (Xorman Ashton) 





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Fig. 4.50. — The visual cells of the tortoise"( X 834) (Xorman Ashton). 



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Fig. 451. — The visual cells of the ^liuray turtle, Chelodina (O'Day). 



