614 ALETS, [Vou. XII. 
Beyond its fifth branch, 7.g/s, and while still inside the 
hollow of the mandible, the maxillaris inferior gives off several 
branches, the arrangement of which differs in almost every 
dissection. There is always one important branch, and often 
two or more smaller ones, sent upward and forward along the 
inner surface of the dentary, imbedded in the fibres of Ao! 
at their insertion, toward the upper edge of the mandible; and 
one important branch sent downward and forward. This last 
branch may reunite with the main nerve just before the latter 
issues from the hollow of the mandible, as was the case on both 
sides of the head in the fish used for the drawings of the under 
surface of the head. 
Immediately after issuing from the hollow of the mandible, 
the maxillaris inferior often sends one or more small anasto- 
mosing branches (Fig. 44, Pl. XX XI) upward along the inner 
surface of the splenial to the r. mandibularis facialis internus, 
and then gives off an important branch, ~g/z, which, like ~ghs, 
runs downward and then medianward and forward ventral to 
the horizontal part of Meckel’s cartilage, between it and the 
dentary, and dorsal to and in immediate contact with the r. 
mandibularis facialis externus. It then turns upward and for- 
ward, and having traversed the anterior end of the hyoideo- 
mandibular fold reaches the outer surface of the inferior 
division of the geniohyoideus, where it continues its course 
medianward and forward, sending numerous branches forward 
and backward along the outer surface of that muscle. One 
large branch directed backward passes the hind edge of the 
inferior division of the muscle, and, continuing along the outer 
surface of the superior division of the muscle, anastomoses with 
a branch of ~ghs as already described. A branch, 7.2, is 
always sent forward and medianward to the outer, ventral sur- 
face of the intermandibularis, which it apparently innervates. 
McMurrich concluded (No. 76, p. 131) that both the inter- 
mandibularis and the anterior division of the geniohyoideus 
were innervated by the trigeminus. 
Beyond the branch ~,g/z the maxillaris inferior, as it continues 
forward to the symphysis, sends many branches upward and for- 
ward in the dentary toward the upper edge of the mandible. 
