274 Journal of Comparative Neurology. 



pies the dorsal side of the ventral lateralis root, being bounded 

 mesially by the communis root of the facialis and dorsally 

 by the dorsal lateralis root (Fig. 3). 



Now, as the ventral lateralis root passes through its fora- 

 men in the cranium, the motor VII swings down along its 

 inner face (Fig. 5) and in the foramen divides into two unequal 

 portions. The smaller one runs along the ventral and caudal 

 face of the emerging lateralis root, then caudad along the dor- 

 sal and cuter face of this root, leaving it, however, as soon as 

 the hyoniandibular trunk turns cephalad. This portion consti- 

 tutes the branch of the r. opercularis profundus VII for the 

 mm. levc-tor and adductor operculi (Figs. 5 and 4, r. op.). It 

 runs back internal to the hyomandibular bone, running along 

 the dorsal face of the pseudobranch, following parallel to the 

 opercular process of the os hyomandibulare and dorsally of it, 

 to its muscles. It is a very minute nerve, carrying a few coarse 

 fibers. 



The larger portion of the motor VII turns ventrad from 

 the hyomandibular foramen (Fig. 6, r. add.) and contributes 

 most of its fibers to the branch of the r. opercularis profundus 

 VII for the mm. adductor arcus palatini and adductor hyoman- 

 dibularis. These muscles lie under the foramen and the nerve 

 spreads out among then: at once, one branch running far ceph- 

 alad along the dorsal surface of the m. adductor arcus palatini 

 as far as that muscle eyiends (Figs. 7, 8, 9, r. ad. pal.). This 

 nerve at its origin is vc\y closely joined to the communis nerves 

 for the r. pre-trematicus VII and Jacobson's anastomosis. 



6. The Supra-orbital Trunk. 



This trunk is composed very nearly as in Menidia, with 

 large lateralis and general cutaneous components and a very 

 small communis clement. The trigeminal and facial superficial 

 ophthalmic nerves are quite intimately joined for most of their 

 courses and the few communis fibers are mingled with those of 

 the r. ophthahiiicus superficialis V. 



The two superficial ophthalmic nerves do not pierce the 

 cranium with the others of the trigemino-facial complex, but 



