. Carnegie Institution of Washington publication. 152 BLIND VERTEBRATES AND THEIR EYES. In a larva 15 mm. long the eye is still in contact with the epidermis on one side and the incipient dura mater on the other. The epidermis is distinctly thinner over the eye, reaching an extreme thinness of 16 p, as compared with a thickness of 40 IJL at a distance of 100 p. below the eye and of p, at 100 p. above the eye. The lens lies directly beneath the skin. In this particular eye (fig. 62 a) it is an ellipsoid, 30 p. by 38 p. (36 by 28 in another eye). It is entirely separated from the skin and t
. Carnegie Institution of Washington publication. 152 BLIND VERTEBRATES AND THEIR EYES. In a larva 15 mm. long the eye is still in contact with the epidermis on one side and the incipient dura mater on the other. The epidermis is distinctly thinner over the eye, reaching an extreme thinness of 16 p, as compared with a thickness of 40 IJL at a distance of 100 p. below the eye and of p, at 100 p. above the eye. The lens lies directly beneath the skin. In this particular eye (fig. 62 a) it is an ellipsoid, 30 p. by 38 p. (36 by 28 in another eye). It is entirely separated from the skin and takes on a deeper stain. The cells of the lens are not very regularly grouped, but apparently they are arranged about a median point or space. The lens lies entirely outside of the eye in contact with the outer face of the dorsal part of the iris. The eye proper is a subspherical solid mass with only a shallow depression below the lens representing the vitreous cavity and choroid fissure. In the eye more particularly described here the depression is filled largely with blood corpuscles (fig. 62 a, ). The pigmented layer is not more than 4 p. thick, and is very sparingly pigmented over the posterior face of the eye. At the iris and the lower margin of the choroid fissure it is continuous with the inner layers of the retina through cells whose nuclei arc distinctly elongate. The retina proper, from the pigmented layer to the vit- reous cavity, is 04 p. thick. • 2ns. -e' '. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Carnegie Institution of Washington. Washington, Carnegie Institution of Washington
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