. Cave vertebrates of America; a study in degenerative evolution. Cave animals; Heteropygii. THE EYES OF TROGLICHTHYS. 129 The oblique muscle is attached by a tendon to the face of the eye opposite that of the attachment of the rectus (fig. 46 a, msc). In the best-developed condi- tion it was found to be but 9 /a in diameter, taking its origin at a point on the level of the lower surface of the olfactory nerve where the latter pierces the ethmoid and 160 /x laterad from it. The muscle itself is in this instance about 200 fj. in length and is attached to the eye by a tendon of equal length. The
. Cave vertebrates of America; a study in degenerative evolution. Cave animals; Heteropygii. THE EYES OF TROGLICHTHYS. 129 The oblique muscle is attached by a tendon to the face of the eye opposite that of the attachment of the rectus (fig. 46 a, msc). In the best-developed condi- tion it was found to be but 9 /a in diameter, taking its origin at a point on the level of the lower surface of the olfactory nerve where the latter pierces the ethmoid and 160 /x laterad from it. The muscle itself is in this instance about 200 fj. in length and is attached to the eye by a tendon of equal length. The rectus in the same individual is 208 /a long. In all the cases enumerated above the muscles of the opposite side were not nearly so well developed. In the one with the well-developed rectus the oblique was indistinct, while in the one with the well-developed oblique the rectus is also well developed, but the striations are not distinct. The scleral cartilages form one of the striking features of this eye. They are quite variable, forming a more or less complete covering for the eye. In some they are several times as long as the eye and in such cases extend much beyond the eye. In one eye 49 /x. in diameter the length of one of the cartilages reaches 160 fi (fig. 45 a). They have not kept pace in their reduction with the reduction of the. 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 Eigenmann, Carl H. , 1863-1927. Washington, D. C. , Carnegie Institution of Washington
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