170 EDWAIJD ?HEI,PS ALUS, JUN. 



bablo, and is later morc^ fully discussed; and it is to Huxley's 

 very definite opinion on tin's subject that I have wished to 

 call especial attention. The lateralis component of this nerve 

 of fishes would not, according- to recent ideas, be retained in 

 the higher Vertebrates ; but the ampullary component quite 

 probably would be retained, and, with such general cutaneous 

 fibres as may belong to the nerve in fishes, it would form the 

 nerve in the higher Vertebrates. 



Ramus Maxillaris Trigemini. 



The first two general sensory branches of the nervus tri- 

 geminus arise from the very base of the large ramus ad 

 muse. lev. max. sup., and would accordingly seem to belong- 

 to the ramus mandibularis trigemini rather than to the 

 ramus maxillaris. They, however, both accompany branches 

 of the i-amus buccalis, and are hence here considered as 

 branches of the maxillaris trigemini. They have both already 

 been referred to in describing the buccalis. One of them 

 accompanies the buccalis branch to organs 83 to 80, and the 

 other the buccalis branch to organs 79 to 82. Both branches 

 run at first backward and outward, near the floor of the orbit, 

 and then forward and outward to the regions they innervate. 



Anterior to these two branches a branch is sent out with 

 the buccalis nerve to organs 75 to 78, and another with the 

 buccalis nerve to organs 70 to 74. These two branches both 

 arise from the hitero-ventral part of the maxillaris, and both 

 run at first forward, downward, and laterally, closely applied 

 to the venti-al surface of the buccalis, and then forward and 

 laterally, passing outward along the lateral surface of the 

 buccalis, between it and the ramus mandibularis. Havino" 

 thus reached the dorsal surface of the large truncus, between 

 its buccalis and mandibulaiis components, they there have 

 their apparent origins from the truncus, and join the buccalis 

 nerves they accompany. 



Beyond these four branches the maxillaris turns downward 

 on to the lateral surface of the muscle Addj3, and as it 



