Herrick, Nerves of Siluroid Fishes. 209 
Both the sensory and motor roots run down internal to the lat- 
eralis root directly to their common foramen. The peripheral 
rami of the vagus which distribute to the skin have been fully 
worked out, while those for the gills and other viscera have 
been studied less thoroughly. 
I. -The motor rami of the vagus complex. 
The motor rami will not be fully described save in two 
cases where the accounts in the literature are contradictory. 
The internal and external pharyngo-clavicularts muscles are 
innervated from the vagus substantially as I have found them 
in Menidia and Gadus. WriGut states that they are inner- 
vated from the first spinals in Amia (’85, p. 138) and Ameiurus 
(84 a, p. 371). ALtis has shown (’97, p. 697) that the former is 
incorrect and now it appears that the latter is also an error. 
Thus the difficulty which I have referred to in the discussion of 
these nerves in Menidia (99, p. 266) disappears so far as this 
type is concerned, and the pharyngo-claviculares of Ameiurus 
are shown to be homologous with these muscles of the other 
bony fishes. JUGE (’99, p. 40) finds that these muscles are in- 
nervated from the inferior pharyngeal branch of the vagus in 
Silurus. 
The trapezius muscle is said by WricutT (’84 a, p. 371) to 
be innervated in Ameiurus catus by the first spinal nerve, stat- 
ing that its ventral branch ‘‘rests on the trapezius muscle which 
it innervates.”” This is clearly an error, for I have traced the 
nerve supplying this muscle back into the vagus ganglionic 
complex and through this complex into the motor vagus roots. 
The first spinal nerve and ganglion pass close to the caudal 
edge of the vagus ganglion, but the microscope shows that 
there is no nervous connection between them. Nor do any 
fibers leave the spinal nerve for. the trapezius muscle. Mc 
Morricu is, therefore, doubtless correct, when he says (’84, p. 
331) that the trapezius of Ameiurus corresponds with that 
muscle of selachians. This also agrees with the conditions 
found in Menidia, but not with those of the cod, as I have shown 
(00, p. 298), nor with the forms described by VETTER. JAQUET 
