14 H. B. POLLARD. 



and passes forward parallel to and just outside and below the maxillary 

 nerve. It turns outward, still parallel to the maxillary nerve, and 

 supplies the posterior face of the maxillo-coronoid tentacle. 



The mandibular nerve (K. md.) passes downwards and forwards and, 

 some little distance behind the coronoid process, it divides into Ramus 

 mandibularis externus and R. md. internus. 



The R. md. extern as passes outside the coronoid process forwards 

 and downwards outside the mento-meckeliau process, and reaches the 

 posterior edge of the mental piece (the large block of precartilage in 

 the lower lip). Here it divides into a number of twigs which supply 

 the fold of skin below and behind this piece. 



The R. md. internus passes inside the coronoid process and divides 

 into two branches which I name mental and submandibular. The 

 mental branch (R. m.ent.) passes forwards, outside and below the mento- 

 meckelian process, internal to the R. md. externus. Proceeding 

 horizontally forwards, it crosses internally the block of precartilage of 

 the lower lip and, reaching the mental tentacle, passes down it, dividing 

 them into two branches, which supply the anterior and posterior aspects 

 of the tentacle. 



The submandibular branch (R. subm.), after parting from the mental, 

 proceeds down outside the mento-meckelian process to the submandi- 

 bular tentacle, dividing into two branches, which supply the anterior 

 and posterior faces of the tentacle. 



The R. md. internus contains motor portions, which pass off where 

 the nerve divides into mental and submandibular branches, and supply, 

 the anterior branches, the muscles of the mental tentacle, and the 

 posterior the muscles of the submandibular tentacles. 



More exact descriptions of the muscles and the motor supply must 

 be reserved for a subsequent work. 



I have not observed any ophthalmic branch of the Trigeminus 

 though some fibres may accompany the Ophthalmicus superficialis of 

 the Facial. 



Sensory Tentacular Nerves of Trichomycterus (Fig. 9). 



The Ophthalmicus profundus (Ii. o.p.) takes its exit from the cranial 

 cavity independently of the maxillary branches, and is at first difficult 

 to distinguish from the Ramus ophthalmicus superficialis of the Facial. 

 It runs below the rectus superior, above the optic nerve, along the 



