A 



,V 



m^^ ^ '-^W*- .1^ 





«:*, -*" ••'^ 



Fig. 640.— The Rod-kich Placental Retina. 

 The retina of the rabbit (Katharine Tansley). 







7. > 

 10, 



Fig. : 

 and 'i 

 the otl 



Fig. 641. — The Cone-rich Placental Retina. 



The retina of the squirrel (Katharine Tansley). 



1, optic nerve fibre layer ; 2, ganglion cell layer ; 3, inner plexiform layer ; 



•ner nuclear layer ; .T, outer plexiform layer ; 6, outer nuclear layer ; 



■rnal limiting membrane ; 8, visual cells ; 9, pigmentary epithelium ; 

 I'oicl. 



'e the few cells in the ganglion cell la^•er and outer nuclear layer in 



in contrast to the larger numbers in Fig. 641. Compare Figs. 754 



In Fig. 641 note that the cones (8) are in two layers, one behind 



