. The fundus oculi of birds, especially as viewed by the ophthalmoscope; a study in the comparative anatomy and physiology . ut a disc-length from the upper end of the opticdisc these dots become grayish-white; indeed, the fundal colorationis distinctly gray towards the upper half of the eyeground. In aregion the same distance towards the temporal aspect of the back-ground may be seen a cluster of pinpoint, brilliant, white dots in themacular area. Penguins use the nictating membrane very fre-quently when light is thrown on this part of the eyeground. Theoptic disc exhibits enamel-white edges;
. The fundus oculi of birds, especially as viewed by the ophthalmoscope; a study in the comparative anatomy and physiology . ut a disc-length from the upper end of the opticdisc these dots become grayish-white; indeed, the fundal colorationis distinctly gray towards the upper half of the eyeground. In aregion the same distance towards the temporal aspect of the back-ground may be seen a cluster of pinpoint, brilliant, white dots in themacular area. Penguins use the nictating membrane very fre-quently when light is thrown on this part of the eyeground. Theoptic disc exhibits enamel-white edges; it is hollowed out in thecentre, like a sewing-machine shuttle. Running across this con-cavity and at right angles to the margin of the disc one sees a largenumber of gray fibres. The pecten lies along the centre of the nerve, where it is orange-red in color and mottled with minute, brown pigment dots. Thepecten has the usual dark chocolate-brown shade. It is of spiralform, like a corkscrew laid on its side. A few slender opaque nervefibres are visible on each side of and at right angles to the disc. 13^> CARINATjE. Ralliformes Plate XIII A ra m ides ipecah a
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Keywords: ., boo, bookcentury1900, bookdecade1910, booksubjecteye, bookyear1917
