CARINATjE 



Anseriformes 



Blue Snow-Goose. Chen ccerulescens. Plate XXYII. 



The fundal color is a distinct fawn, sprinkled with small, round, 

 orange-pink dots of irregular shape and size. Running vertically 

 past and parallel with the optic papilla, over the lower half of the 

 fundus are numerous, straight orange-red choroidal capillaries. 



The fovea is probably indicated by a small, glistening white dot 

 above the end of the disc on the nasal side. 



The optic nerve head is boat-shaped, tinted orange along its 

 central zone, and shows a narrow rim of coarse opaque nerve fibres 

 that form a fringe about its circumference. This orange centre is 

 sprinkled with numerous minute, dark-brown or black dots. A 

 few gray opaque nerve fibres arise from the disc margins and cross 

 the fundus horizontally. The pecten, of corkscrew shape, runs the 

 whole length of the disc and comes well into the vitreous. 



Pelecaniformes 

 Cormorant. Phalacrocorax carbo. Plate XXVIII. 



The fundus oculi is mostly of a slate-gray color, uniformly 

 sprinkled with numerous, minute white dots, closely packed together. 

 Running chiefly parallel with the long axis of the optic disc are 

 several rather straight, orange-red choroidal capillaries, that extend 

 the whole length of the papilla and beyond its inferior extremity. 



The macular area is seen a little above the upper end of the 

 optic disc and on the nasal side of the nerve. The fovea appears 

 as a reflex image of a few short, bright, white lines surrounded by a 

 narrow ring. 



The optic disc appears as if it were composed of a mass of very 

 white, cotton-like fibres, disposed as a fringe all about the papillary 

 margin. The central area of the disc, especially on each side of 

 the root of the pecten is orange-red, stippled with minute, brown 

 pigment grains. Perpendicular to the papillary margins are a few 

 short, fine opaque nerve fibres, that run towards and are finally lost 

 in the peripheral eyeground. 



The pecten is rather long and of the usual chocolate color; it is 

 much narrower than usual on the upper half of the disc, and comes 

 well forward into the vitreous humor, extending behind the margin 

 of the pupil. 



146 



