CARINATjE 



Strigiformes 



Tawny Owl. Syrnium ahico. Plate XXXVII. 



On the outer aspect of the papilla and about one disc-length from 

 it on a level with the upper margin of the pecten, is a slight depression 

 almost devoid of choroidal vessels. Its centre is a dark red color, 

 and on the margins of the depression and surrounding it is a bright 

 circular reflex. For some distance outside this fovea] ring the eye- 

 ground is seen as if one were viewing it through a translucent, grayish 

 mist or haze; and the fundus thus seen generally appears to be 

 granular with a few, small choroidal vessels showing here and there. 

 Inside the ring, however, the details are strikingly clear, and the 

 coloration bright red. Above the macula, on the outer side of the 

 disc, is a quantity of dark pigment deposited between the choroidal 

 vessels, by contrast making the latter stand out as of a bright orange 

 color. The inner aspect of the fundus appears yellow; it exhibits 

 numerous choroidal capillaries whose yellow tint is distinctly brighter 

 near the inferior segment of the disc. 



--& 1 



Common Barn Owl. Strix flammed. Plate XXXVIII. 



The general tone of the eyeground is dull gray, with bright orange- 

 red choroidal vessels distributed all over the fundus except at the 

 macular region. At this area the tint is much grayer, being, in 

 addition, stippled with small, irregular blotches of orange-red and 

 gray dots. The macula, also suffused with a deep gray reflex, is 

 situated above the upper end of the optic disc and nearly in a line 

 with the long axis of that organ. 



The papilla is long and narrow with pointed ends, and appar- 

 ently made up of coarse white fibre-bundles the central portion of 

 which is covered with minute, brown, pigment grains, that have a 

 distinctly reticulated appearance. These white fibres border the 

 nerve head all around. 



The dark-brown, convoluted pecten is large and extends well 

 forward towards the lens. From both sides of the disc radiate a 

 few, dull-gray fibres that stretch a short distance across the fundus 

 and then disappear. 



1.56 



