172 EDWARD PHELPS ALLIS, JUN. 



in their forward and outward course from their real to their 

 apparent points of origin. 



The lateral one of these two raaxillaris branches has the 

 most posterior origin from the maxillaris. After it has 

 become detached from that portion of the buccalis that it 

 accompanies, it runs laterally and downward until it reaches 

 the inner surface of a membrane that here bounds the inner 

 surface of the region occupied by the buccal ampullse and 

 ampullary canals, where it turns backward, downward, and 

 mesially along the inner surface of that membrane. In this 

 position, having first sent a small branch forward, it con- 

 tinues backwai'd, downward, and mesially until it reaches 

 the anterior end of the integumental furrow that separates 

 the maxillary labial fold from the under surface of the head. 

 It then continues backward along that edge, lying ventro- 

 mesial to it, and gradually disappears. 



The other one of the two branches also soon turns down- 

 ward and backward, sending two small branches forward at 

 the bend. It remains at first close to the latero-ventral 

 surface of Add/3, but later passes into the maxillary labial 

 fold, which it innervates. Whether or not it continues 

 backward until it reaches and enters the mandibular labial 

 fold also could not be determined. 



One or both of these two branches evidently correspond 

 to the so-called maxillary branch of the superior maxillary 

 nerve of Amia and teleosts. 



Anterior to these two branches the main maxillaris nerve 

 acquires a position directly internal to the buccalis, and there 

 gives off a large branch from its ventral edge, and another 

 from its dorsal edge. The ventral branch is joined by the an- 

 terior branches of the branch just above described, with which 

 it fuses. The nerve thus formed runs downward, mesially 

 and but slightly forward, passes beyond the ventro-niesial 

 edge of the muscle Add/3, and reaches the ventral surface 

 of the extreme anterior end of the palato-quadrate cartilage. 

 There it crosses the middle line of the head as a stout nerve, 

 and hence doubtless here anastomoses with its fellow of the 



