. Anatomischer Anzeiger. Anatomy, Comparative; Anatomy, Comparative. 606 lateral one of these two parts ran almost directly backward and up- ward to the usual place of insertion of the muscle on the dorsal sur- face of the eyeball. A large part of the fibres of the other, mesial part of the muscle ran backward, upward, and mesially and were in- serted, by tendon, on the ventral surface of the dorsal wall of the orbit, mesial to the line of the supraorbital lateral canal. The tendon of this part of the muscle passed, in its course, ventral and then mesial not only to the nerve that supplies the
. Anatomischer Anzeiger. Anatomy, Comparative; Anatomy, Comparative. 606 lateral one of these two parts ran almost directly backward and up- ward to the usual place of insertion of the muscle on the dorsal sur- face of the eyeball. A large part of the fibres of the other, mesial part of the muscle ran backward, upward, and mesially and were in- serted, by tendon, on the ventral surface of the dorsal wall of the orbit, mesial to the line of the supraorbital lateral canal. The tendon of this part of the muscle passed, in its course, ventral and then mesial not only to the nerve that supplies the sense organs of the supra- orbital lateral canal, but also to what I take to be that part of the ophthalmicus superficialis that supplies the ampullae near the lateral edge of the snout. It passed lateral and dorsal to another large branch of the ophthalmic nerves '?f opp Add<^. opp that ran forward on to the top of the snout mesial to the above mentioned branch. The remaining fibres of this mesial half of the muscle joined those of the lateral half and were inserted with them on the eye-ball. Cer- tain of the fibre of this, communicating, part of the muscle arose directly from Fig. 1. Top view of left eye of Carcharias. Add^ part of ad- ductor mandibulae muscle, oi ob- liquus inferior muscle, os obliquus superior muscle, opp ramus oph- thalmicus superficialis. re rectus externus muscle. 7-it rectus internus muscle, rs rectus superior muscle. tr nervus trochlearis. the cartilage of the anterior end of the orbit, but a large part of them arose in and apparently from the fibres that had their insertion on the dorsal wall of the orbit. That part of the muscle that went from orbit wall to orbit wall was, naturally, wholly functionless excepting as it offered a point of insertion for those fibres that ran from it to the eye-ball. Both parts of the muscle were innervated by the nervus trochle- aris, the branches of which were distributed to it as shown in the accompanying cut. Th
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