294 H. W. NORRIS 
The main trunk passes around the ventro-lateral border of the 
eyeball, exhibiting three main branches: (1) the ramus buccalis 
proper (buc. 1) which extends antero-ventrally, ventral to and 
grazing the extreme posterior tip of the lateral wing of the nasal 
capsule, thence along the ventro-lateral border of the upper lip, 
ending just ventral to the nostril, supplying the infraorbital series 
of neuromasts along the upper lip as far as the prenaris (figs. 9-3) ; 
(2) more or less distinct from (1) and running parallel with it, 
sometimes dorsal and in others cases ventral to it, nearly to its 
extreme anterior end, is a general cutaneous branch (mza.1), the 
ramus maxillaris V, which innervates the skin of the upper lip 
and that ventral to the eye; (3) a smaller nerve of general cuta- 
neous and lateral line composition (buc.3 + ma.3), running around 
and close against the eyeball, passes nearly straight anteriorly 
lateral to the lower edge of the wing of the nasal capsule, ending 
immediately dorsal to the nostril. Its lateral line fibers innervate 
neuromasts of the infraorbital series which extend from the ventral 
border of the eye anteriorly, ending just over the nostril. 
6. The ramus mentalis internus VII 
The hyomandibular trunk (of lateral line, general cutaneous and 
visceral motor fibers) on emerging from the facial canal immedi- 
ately divides into two main portions, a posterior ramus jugularis 
and an anterior lateral line ramus mentalis. The latter almost 
immediately divides into the two characteristic rami, mentalis 
internus and externus. The ramus mentalis internus passes 
posteriorly, laterally and ventrally around the lateral border of the 
depressor mandibulae muscle to the lower medial border of the 
lower jaw, thence anteriorly, at first ventral to the insertion of 
the pterygoid muscle, soon dividing into two portions, the medial 
of which shifts medially to the ventral border of the interhyoideus 
muscle, while the lateral division runs along the ventral medial 
border of the pterygoid muscle both finally passing along the ven- 
tral surface of the intermandibularis muscle (figs. 13, 11, 8, 6). 
The ramus mentalis internus innervates the neuromasts which 
seem to correspond to the typical amphibian gular series as de- 
scribed by Kingsbury (’95 b), situated on the side and ventral 
