296 H. W. NORRIS 
about thirty neuromasts which may be termed an angular series. 
But between these and the oral series there seems no natural de- 
marcation; in fact, it is doubtfully allowable to distinguish be- 
tween them in any urodele amphibian. The ramus mentalis 
externus was overlooked by Fischer. 
8. The ramus jugularis VII 
From the point of its separation from the lateral line compo- 
nents of the truncus hyomandibularis the ramus jugularis passes 
at first anteriorly around the anterior dorsal border of the depres- 
sor mandibulae muscle, and thence ventrally, laterally and posteri- 
orly around the lateral border of the same muscle. As it leaves 
the hyomandibular trunk it gives off posteriorly a small motor 
branch (dma. + lhy.) to the anterior division of the depressor 
mandibulae and to the levator hyoidei muscles. Near the same 
point it receives the ramus communicans X ad VII of general 
cutaneous fibers. As the ramus jugularis passes postero-ventrally 
around the muscle it gives off a number of small branches from 
its posterior border. ‘Two of these branches run to the posterior 
division of the depressor mandibulae muscle (dmp.). In one 
specimen the jugularis of the left side was found to receive a 
large anastomosis of general cutaneous fibers from the mandibularis 
V (fig. 13, md.2), but on the other side no trace of such a union 
could be found. Other branches given off from the posterior 
border of the nerve supply the cerato-hyoideus externus and inter- 
branchialis 1 muscles and furnish general cutaneous elements 
to the skin overlying these muscles (che.+2b.1). The ramus 
jugularis toward the lower border of the depressor mandibulae, 
curves anteriorly and innervates the interhyoideus muscle (7h.). 
Wilder, following Fischer, incorrectly ascribes the innervation 
of the m. ceratohyoideus externus to the ninth nerve. 
9. The lateral line anastomosis with the vagus nerve 
At the dorso-lateral border of the dorsal lateral line ganglion, 
a little posterior to the emergence of the truncus supraorbitalis 
from the ganglion, there is a small tract of lateral line fibers (fig. 
12, VII ad X). These pass anteriorly at the edge of the ganglion 
