McGregor, Cranial Nerves of Cryptobranchiis. 47 



branches respectively as ramus nasalis externus I and ramus 

 nasalis externus II. The former, as shown by Wilder, receives 

 a branch from the ramus maxillaris V. 



In addition to the branches already described there is a 

 small branch entering the eye-ball which is probably to be re- 

 garded as the ciliary nerve, and another small branch which is 

 traceable to the region of the antorbital fissure in the nasal 

 capsule. The latter branch is probably distributed to the glands 

 of the nasal region, but a study of serial sections will be neces- 

 sary to settle this point. 



The ramus maxillaris superioris of the Trigeminus breaks 

 up into several branches immediately upon leaving the cranium. 

 It runs dorsad of the masseter muscle then dips ventrad of the 

 eye supplying numerous branches to the skin of the upper lip 

 and anatomosing with the ramus nasalis externus of the deep 

 ophthalmic. A branch also runs along the floor of the nasal 

 capsule as described in connection with the ramus ophtJialmicus 

 profundus. The ramus maxillaris superioris is accompanied for 

 some distance by the ramus ophthalmicus superficialis of the 

 facial nerve, and the two are described together by Herrick in 

 Amblystoma as ramus f ronto-maxillaris . Though the two nerves 

 run close together for a part of their course, they are separate 

 as, far back as the ganglion Gasseri. It is almost certain that 

 one of the branches which appears to belong to the superior 

 maxillary ramus represents the ramus buccalis VII (in the 

 sense in which this name is used by Strong and the writers on 

 fishes). This view is supported by the presence of well-devel- 

 oped lateral line organs between the eye and the angle of the 

 mouth, the so-called infra-orbital sense organs. 



The ramus mandibularis V is larger than either of the 

 other two rami. At its point of exit from the skull it gives a 

 small branch to m. temporalis, then, trending laterad, it pierces 

 m. masseter to which it contributes several twigs. At about 

 the middle of its course through m. masseter a fairly stout 

 branch separates from the main ramus and runs latero-caudad 

 passing through a slight notch under the lateral border of the 

 squamosal bone. This branch sends a number of twigs ceph- 



