AMPHISB^ENA. 47 



The Ganglionic Layer. The ganglionic layer (9, fig. 15 a) consists of a single 

 layer of nuclei 6 p- in diameter, with now and then another nucleus above or below 

 the single layer. From the outer side of these nuclei, fibers which run out and 

 penetrate the inner reticular layer can be traced for a short distance. On the 

 opposite side are also fibers which continue as fibers of the nerve fiber layer. In 

 Anolis this layer measures 23 /A and is made up of loosely connected nuclei, some 

 of which are large and spherical, others are smaller and irregular, while still others 

 stain very densely. 



The Nerve-fiber Layer. - - The nerve-fiber layer is 6 p. in depth, while in Anolis 

 it is 26 fj.. 



The Fibers of M tiller. - - The Mullerian fibers can be traced from the membrana 

 limitans interna to the outer nuclear layer. They commence at the inner surface 

 of the retina by a broad conical foot which extends into the ganglionic layer. 

 Through the inner reticular layer the fibers pass as fine filaments, but in the inner 

 nuclear layer each fiber is characterized by an irregularly shaped nucleus, which 

 stains densely and shows no structure. The membrana limitans externa is not 

 visible. These fibers differ but little from those in Anolis, except that those in 

 Anolis can be traced to the membrana limitans externa, which is plainly visible. 



