A^IPHIBIANS 



Figs. 406 and 407.— The Anuran Retina. 



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Fig. 406. — The retina of Rana temporaria. 



Note the vessels of the membrana vasculosa retinae lying on the inner surface 

 of the retina (above) ( x 320) (Norman Ashton). 



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Fig. 407. — The retina of Xenopiis hevis ( X 450) (Katharine Tansley). 



(1) optic nerve fibre layer ; (2) ganglion cells ; (3) inner plexiform layer 

 (4) inner nuclear layer ; (5) outer plexiform layer ; (6) outer nuclear layer 

 (7) visual cells ; (8) pigmentary epithelium ; (9) choroid. 



