100 EDWARD PHELPS ALLIS, JUN. 



of the nervus buccalis. This posterior prolongation of the 

 buccalis ganglion lies close against the side wall of the 

 orbital part of the sknll, and extends backward a short 

 distance behind the hind edge of the trigeiuino-facial 

 foramen. The three nerves that arise from it run upward 

 and backward along the side wall of the skull^ which here 

 belongs to the interorbital wall, and come into such intimate 

 relations with each other that it is impossible to determine 

 whether there is or is not an interchange of fibres between 

 them. One of the three nerves that again appear after this 

 intimate juxtaposition separates into two branches, both of 

 which pierce the overhanging cartilaginous roof of the orbit, 

 near its hind end, and reach its dorsal surface,the roof of the 

 orbit here being formed by a projecting part of the post- 

 orbital process. One of these two branches there innervates 

 organs 108 to 110 infra-Orbital, those organs lying in that 

 section of canal that is called by Garman the occipital, and 

 that is included between the points where the supra-orbital 

 canal and the supratemporal cross-commissure anastomose 

 with the main infra-orbital canal. The other branch inner- 

 vates organs 97 to 102 infra-orbital, which organs are 

 postorbital, or, more properly, as will be later shown, 

 postf rental in position. A second one of the three principal 

 nerves innervates organs 92 to 96, which are postorbital 

 in position ; the third nerve innervating organs 87 to 91, 

 which are also post-orbital in position, organ 87 lying 

 between the third and fourth tubules ventral to the spiracle. 

 Several of the branches of the second nerve pierce the 

 overhanging cartilaginous roof of the hind end of the orbit 

 to reach the organs they innervate. The branches of these 

 two latter nerves all pass outward immediately anterior to 

 the dorsal end of the superior postspiracular ligament, 

 which will be later described, and also immediately anterior 

 to the levator maxillae superioris muscle. 



Organs 87 to 110 infra-orbital thus form a single large 

 group, sub-divided into four sub-groups. Along the canal, 

 between organs 89 to 96, there were no tubules leading to the 



