Fig. 3.

Extraocular muscles and semicircular canals in dorsal view. (A) Frontal-eyed mammal. (B) Lateral-eyed mammal. The change in sign of the angles between frontal- and lateral-eyed mammals indicates that the muscles and canals have converged beyond parallel and begun to diverge in the opposite direction. (C) Extraocular muscles and semicircular canals of mammal, lateral view. Ipsilateral and contralateral muscles have been superimposed onto the same eye for ease of representation. Abbreviations as in Table 1 and Fig. 1.