200 JouRNAL OF COMPARATIVE NEUROLOGY. 
save at the peripheral ends of some of the minor branches does 
it receive, other) than lateralis. fibers... °Cf.’ Figs. 1, 23s 
5, 7. Ou. 
As soon as the maxillary and mandibular nerves are formed 
the r. buccalis takes up a position dorsally of them and in the 
notch between them, at the same time sending off a consider- 
able branch laterally which is comparable with the outer buccal 
branch of Gadus. (Figs. 1, 2, 3, 4, out. buc.) This branch 
runs outward in the narrow space under the m. levator arcus 
palatini and above the m. adductor tentaculi closely accom- 
panied by the accessory maxillary nerve (ac. mx). Having 
reached nearly to the caudal border of the eye, the two nerves 
anastomose and break up into numerous branchlets. One 
lateralis twig supplies the sixth organ of the infra-orbital canal, 
two others run back under the sixth sub-orbital bone and ap- 
parently supply small pit organs behind this region, while 
another runs farther laterally to supply small pit organs near 
the fifth infra-orbital canal organ and a line of similar organs ex- 
tending caudad from this point continuing in the direction of 
the horizontal limb of the infra-orbital canal. The later twig is 
comparable with the one marked @. f. 0. on my plot of Gadus 
(00, Plate XXI). 
A small twig arises just in front of the outer buccal and may 
be regarded as a detached filament of that nerve, running along 
the lateral side of the mandibular nerve for a short distance, then 
turning out under the eye, to innervate the fifth sense organ of 
the infra-orbital canal (7. s. 5; Figs. 1, 3). At the point where 
the r. mandibularis separates from the infra-orbital complex to 
enter the lower jaw the r. buccalis divides into three branches. 
The smaller one runs out under the eye to supply the fourth 
organ of the infra-orbital canal. One of the other branches 
supplies the third organ of this canal and small pit organs along 
the entire length of the horizontal limb of the infra-orbital canal, 
and also sends a twig forward to anastomose with the nerve for 
the second organ. The third branch sends a twig to the second 
canal organ, which first receives the anastomosing twig just 
referred to, then a branch for the first organ, which also sends 
