CARINATJE 



Pelecaniformes 



Gannet. Sula bassana. Plate XXIX. 



The general color of the eyeground is dull yellow with a gray 

 tint, everywhere covered with light gray dots, that are most numer- 

 ous on the upper half of the fundus. Below, and on each side of 

 the optic nerve, are several orange-red choroidal vessels, that are 

 fairly straight and run parallel with the long axis of the disc. 



The nerve entrance and pecten are situated rather high up in 

 the field; consequently it is easy to examine the details of the peri- 

 papillary background. 



Above the upper end of the optic disc and a little towards the 

 nasal side, is a small circular macular area, red in tone but surrounded 

 by a larger circle, like a gray shadow. The margins of the latter 

 gradually fade into the background. The visible margins of the 

 papilla, apparently composed of coarse, white, opaque fibres, are 

 not, as in many species, covered by the pecten. The central part, 

 near the root of the pecten, is orange-red in color. 



The pecten itself is evidently attached to the disc for nearly its 

 entire length, and it does not come forward towards the lens. 



Australian Pelican. Pelecanux conspicillatus. Plate XXX. 



The color of the eyeground is a dull but deep gray, sprinkled 

 generally with irregular dots that are most numerous in the upper 

 part of the fundus. The lower quadrants of the field are covered with 

 a rather faint orange-red, choroidal capillary system, disposed in a 

 vertical direction. The disc is a wide, pointed oval, exhibiting a 

 number of bright-red orange ridges that are uniformly stippled with 

 black pigment dots. The disc margins stand out as a clear white. 

 The pecten, broad and massive, seems to fill the pupillary area. It 

 projects far into the vitreous, reaching, indeed, the posterior surface 

 of the lens. In spite of its large size and intraocular disposition both 

 the free and the attached ends of the pecten can be outlined by the 

 ophthalmoscope. Passing in a radical direction from its circum- 

 ference is a number of opaque nerve fibres. 



The single macula is to be found on the inner side of the fundus. 

 It is surrounded by a narrow, sharply defined, reflex ring of greenish 

 color. 



148 



