182 J. B. Johnston 
Spinal ventral 6 arises at about 625. Its ventral ramus could 
not be completely traced. 
Spinal dorsal 6 arises at 635, has its ganglion and dorsal ramus 
at 627, and its ventral ramus joins the vagus at 660. 
Spinal ventral 7 arises at 665 and has been wrongly placed 
in the plate at 655. Its ventral ramus reaches the lateral sur- 
face ofthe vagus trunk at 697 and a part or the whole of its fibers 
go on ventro-caudally to supply the lateral body museles. It is 
probable, from what we know of the embryology, that only a part 
of these fibers form this small branch, as there are muscles belonging 
to the myotome of this nerve ventral to the gill slits which should 
be innervated by it by way of the reeurrent branch of the vagus. 
Spinal dorsal 7 arises at 695 and is wrongly placed in the 
plate at 705. Its ventral ramus joins the vagus trunk at 731. 
Spinal ventral 8 arises at 718, divides into dorsal and ventral 
rami and the latter joins the vagus trunk in 760. 
Spinal dorsal 8 arises at 742, has its ganglion and dorsal ramus 
in nearly the same plane, and its ventral ramus joins the vagus 
trunk at 780. 
Spinal ventral 9 arises at 778, divides into dorsal and ventral 
rami, the latter of which joins the vagus trunk at 795. 
Spinal dorsal 9 arises at 800, has its ganglion and dorsal ramus 
in the same plane and its ventral ramus joins the vagus trunk 
in 820. 
Spinal ventral 10 arises at 825, divides into dorsal and ventral 
rami, and its ventral ramus joins the vagus in 870. 
Spinal dorsal 10 arises at 868, has its ganglion and dorsal 
ramus in the same plane and its ventral ramus joins the vagus 
trunk in 890. 
Spinal ventral 11 arises at 875, and at 912 a part of its fibers 
enter the vagus, the rest going directly to the lateral body musecles. 
Spinal dorsal 17 arises at 905, has its ganglion and dorsal 
ramus in the same plane, and its ventral ramus joins the vagus 
trunk in 925. 
Spinal ventral 12 arises at 928. Its ventral ramus passes close 
over the lateral surface of the fine fibered vagus trunk and enters 
the coarse fibered »hypoglossus« trunk at 960. 
Spinal dorsal 12 arises at 955 and has its ganglion and dorsal 
ramus in the same plane. Its ventral ramus descends to the outer 
surface of the fine fibered vagus trunk which it aecompanies for a 
