182 KDWARD I'HELPS ALLTS, JIIN. 



oro-ans of tlio mandihulai' cminl. The inandiljiilavis trio-omiiii, 

 Loyoud tliis point, rontiniies forward, in two ])i'iiici]:)al 

 l)raiirlios and otlicr sinallor ones, toward tlio tip of tlio jaw, 

 lyiiiii" always suporfieial to tlio iiiaiidil)nlar cartilao-e. 



Norvns facialis. 



Tlie trmicns liyoidoo-iiiandibiilaris facialis and the ramus 

 palatinus facialis arise separately from the facial part of the 

 extra-cranial trig-pniino-facial o-ang-lion, the one from its dorso- 

 ]iosterior poi'tion, and the other from its ventral portion. 



Ramus palatinus facialis. — The ramus palatinus runs 

 at first downward and almost directly laterally, along the 

 shelvino" hut nearly horizontally cartilaginous floor of the 

 orbit. In this part of its course it passes dorso-lateral to tlie 

 hind end of the orbital part of the posterior carotid artery, 

 ]:)Osterior (proximal) to its orbital branch, and then mesio- 

 ventral to the anterior carotid artery. 



Before reaching the lateral edge of the floor of the orbit 

 it sends three branches backward, two of them arising from 

 it close to its base. The proximal branch separates into two 

 parts. One of these parts runs backward in the angle 

 between the side wall of the skull and the floor of the orbit, 

 and, leaving the orbit at its hind end, turns outward posterior 

 to the anterior diverticulum of Wright's descriptions of the 

 spiracular cleft. There branches are sent to the mucous 

 lining of the cleft, the main branch itself joining and becom- 

 ing confounded with the supei'ior postspiracular ligament as 

 that ligament passes downward behind the spiracular cleft. 

 There is here, perhaps, an anastomosis with a small branch of 

 the glossopharyngeus. This branch of the ]ialatinns facialis 

 thus seeks, and acquires in its terminal ]iortiou, a post- 

 trematic distribution, and is, accordingly, a recurrent branch 

 of the ramus anterior of the nervus facialis, similar to certain 

 branches of the rami anteriores of the vagus nerves shown in 

 my drawing 59 of Amia (3). 



The other part of the proximal branch of the palatinus 



