150 EDWARf) PHELPS ALLIS, JR. 



cranial cavity through an independent foramen, a ganglion 

 beginning to form on the general sensory fibers as they traverse 

 the foramen, but lying in large part beyond it. In addition to 

 the fibers from these two roots, which are currently considered 

 to form the entire nerve, I consider the lateralis and communis 

 fibers that form the rami ophthalmicus superficialis, oticus, and 

 buccalis to belong to it, these latter fibers all arising from the 

 anterior portion of the intracranial lateralis-communis ganglion. 



The ramus ophthalmicus superficialis contains both lateralis 

 and communis fibers, issues from the cranial cavity through an 

 independent foramen, and has the usual course through the 

 dorsal portion of the orbit. Close to it, on each side of the two 

 specimens examined in serial sections, a small nerve arises from 

 the lateralis-communis ganglion, traverses an independent 

 foramen, and, running forward, either goes directly to nerve 

 pits, or first forms anastomoses with branches of the ramus 

 profundus and then supplies those pits or laterosensory organs. 

 This little nerve was not found in the adult. 



The ramus oticus arises from the intracranial lateralis-com- 

 munis ganglion, and contains both lateralis and communis 

 fibers. It perforates the lateral wall of the chondrocranium by 

 an independent foramen, runs upward along its external surface, 

 then again traverses a part of that wall, and issues in the bottom 

 of the deep anterior end of the f-shaped groove described by 

 Bridge ('79) on the dorsal surface of the chondrocranium. 

 There it sends a branch to two organs, apparently laterosensory, 

 which lie in a diverticulum of the spiracular canal which traverses 

 the foramen called by Bridge the foramen x. The nerve then 

 separates into two parts, one of which perforates an overhanging 

 ledge of cartilage and innervates certain organs in the main, 

 infraorbital canal. The other part enters a canal in the car- 

 tilage, sends branches upward, while traversing it, to innervate 

 nerve pits on the dorsal surface of the head, and issues from it 

 at the dorsal edge of the articular facet for the hyomandibula to 

 there anastomose completely with the supratemporal branches 

 of the glossopharyngeus and vagus nerves. This ramus oticus 

 is quite certainly a branch of the buccalis, and must be either a 



