THE RELATIONS OF REPTILIAN TO AVIAN FUNDI 



117 



Reptilia 

 Turkish Gecko. Hcmidacfylus turcicus. 

 Erect image; left eye. The fundus appear- 

 ances (Plate LIX) of this nocturnal lizard 

 remind one of the Kiwi (Plate IV). The 

 orange-red background is uniformly dotted 

 with dark spots, while the circular papilla is 

 completely obscured by a chocolate-brown 



Fig. 145 

 Pecten of a Turkish Gecko (Hermidactylus turcicus). 



pecten, whose pointed free end projects a 

 medium distance into the vitreous. There 

 are no signs of retinal or choroidal vessels. 

 Clearly defined, white lines (opaque nerve 

 fibres) radiate from the disc margins, giving 

 the effect of a halo about the central zone of 

 the picture. 



A lateral view of the Gecko pecten is seen 

 in Fig. 145; it is suggestive of a similar view of 

 the Apteryx pecten (Fig. 27). 



Horned Toad. Phrynosoma cornutum. 

 Plate LX. Left eye. Erect image. The 

 color of the fundus oculi is a dark slate, irregu- 

 larly strewn with minute, whitish dots of 

 various sizes. There is an ill-defined macular 

 region. 



The pear-shaped, grayish papilla has a 

 white margin, from which short fibres of un- 

 equal length radiate towards the periphery. 

 A single central (?) artery seems to originate 

 from the nervehead and with its six branches 

 — two on one side of the disc, four on the 

 other — is supplied mostly to the lower half 

 of the eyeground. Above, a small branch 

 anastomoses with a twig that runs from the 

 periphery of the field. 



Indian Cobra. Naia tripudians. Plate 

 LXI. Left eye. Erect image. The general 

 coloration of the fundus of this Snake is light 

 gray-blue, sparsely dotted with pigment of a 

 similar but deeper color. The whole back- 

 ground is regularly covered with opaque nerve 

 fibres whose radiate disposition reminds one 

 of Merula (Plate LVII). From the button- 

 like optic disc arise three vessels, apparently 

 two arteries of small size and one (larger) 

 vein. The centre of the papilla shows the 

 remains or the undeveloped tissues of a 

 pecten. 



