CARINATiE 



Psittaciformes 



Great Sulphur-crested Cockatoo. Cacatua galerita. 



Plate XLI 



The background is of a fairly uniform, light, grayish-blue color, 

 sprinkled with minute white dots interspersed with many less numer- 

 ous but somewhat larger dark gray deposits. The macula, at the 

 upper-inner quadrant, is an irregularly round, light brownish area 

 whose diameter is half the disc length; and whose periphery fades 

 into the surrounding gray of the fundus. The upper sixth of the 

 long, pointed papilla is distinctly visible where it is not covered by 

 the indented pecten, whose twelve double folds have a corkscrew 

 termination above. Portions of the disc borders can be seen from 

 above through the plications, except at its posterior terminal, where 

 the dark-brown mass entirely covers it. Faint, whitish lines of 

 opaque nerve fibres extend from the margins of the upper half of 

 the disc a short distance across the centre of the eyeground. 



Coraciiformes 

 Laughing Kingfisher. Dacdo gigas. Plate XLII. 



The fundus oculi is in general of a light fawn-gray color mingled 

 with irregularly shaped white or gray-white dots, except in the 

 neighborhood of the optic nerve where it is orange-red, like the glow 

 cast on the sky by the setting sun. The optic nerve entrance is long 

 and narrow; it is white except along its central area, which is orange- 

 red striped with brown pigment dots. A large number of opaque 

 nerve fibres run out on each side of the optic nerve and at right angles 

 to it. The pecten is very long and narrow and has the appearance of 

 a brown centipede. 



The macula is very conspicuous. About half a disc-length from 

 the upper end of the nerve, towards the nasal side, is a small, round, 

 dark depression, surrounded by a very narrow, bright green ring. 

 This circle encloses a smaller area that is of a darker gray and devoid 

 of the dots seen at other parts of the eyeground. The fovea nasalis 

 always appears directly opposite the pupil; there is no fovea tempo- 

 ralis visible to the ophthalmoscope. 



160] 



