CARINATvE 



Piciformes 



Gila Woodpecker. Centurus uropygialis. Plate XLVII. 



The fundus oculi is dull gray tinted with yellow and nearly uni- 

 formly charged with minute, gray dots. At the superior termination 

 of the optic disc (on the nasal side) is a small gray depression, partly 

 surrounding a central, well-marked and glistening white dot. Within 

 this area are also several golden yellow dots. 



The outlines of the optic nerve entrance are well defined, and 

 the central area of the papilla at its union with the pecten is dull 

 orange stippled with dark brown pigment. The papilla is fringed 

 with coarse white fibres. A large number of translucent nerve fibres 

 radiate from the edge of the optic disc on all sides; they become 

 fainter and fainter as they approach the fundal periphery and 

 finally disappear. 



The pecten, of the usual chocolate brown color, reveals several 

 corkscrew convolutions. It comes well forward towards the lens, 

 and presents a massive, club-shaped appearance. 



Greater Spotted Woodpecker. Dryobates vel Dendrocopus major. 



Plate XL VIII. 



The color of the eyeground is a dull but definite gray, interspersed 

 with a large number of small, gray dots. Below the optic disc and 

 pecten are a few faint, orange-red choroidal vessels. The optic disc 

 is apparently made up of a mass of brilliant, white, nerve fibres, 

 very short and thick. In the form of radiations from the margins 

 of the papilla towards the fundal periphery are many gray opaque 

 nerve fibres that appear to occupy a plane lower than the white ele- 

 ments of the disc. The pecten has three corkscrew convolutions on 

 the disc, while its lower part forms a club-shaped mass of a dee]) 

 chocolate-brown color that appears to come well forward towards the 

 lens. 



There seems to be only one sensitive central area. This single 

 macula is on the nasal side of the pecten and has the appearance of a 

 brilliant, white, round dot, the fundus surrounding it being a little 

 darker than the general color of the eyeground. The surrounding 

 gray area makes the white fovea stand well forward almost as if it 

 were actually situated in the vitreous. No reflex ring can be seen 

 around it. 



166 



