No. 3.] MUSCLES AND NERVES IN AMIA CALVA. 625 
sense-organ fibres. In the 35 mm. and 40 mm. specimens 
examined in my earlier work the ventral portion of the root of 
the nervus lineae lateralis seemed to pass through the dorsal 
part of the main root of the glossopharyngeus, receiving there 
an important addition to its fibres (No. 3, p. 517). In all the 
adult specimens that I have examined such is also the apparent 
relation and arrangement of the nerves, for I have never found 
a ventral bundle of the nervus lateralis lying ventral to the root 
of the glossopharyngeus. I therefore conclude from my pres- 
ent work that the relations of the nerves must vary in different 
specimens, or at different ages. I am also convinced that it is 
the so-called dorsal root of the glossopharyngeus that receives 
fibres from the nerve of the lateral line, and not the reverse, as 
I formerly supposed. Whether that dorsal root is formed 
entirely of fibres derived first from the root of the nerve of 
the lateral line and later from the ramulus ampullae posterioris 
acustici or not, I have been unable to positively determine. 
Such seems to me, however, to be the case. As the communi- 
cating branch between the acusticus and the dorsal root of the 
glossopharyngeus lies proximal to the crista amp. post., there 
is thus something in Amia to support the view that the nerve 
to the posterior ampullae is sometimes derived from the glosso- 
pharyngeal nerve (No. 5, p. 232). 
In the adult, in the four specimens examined after my atten- 
tion was called to the matter, two small anastomosing branches 
were always found, one running proximally from the posterior 
surface of the glossopharyngeus distally into the outer and 
lower surface of the nervus lineae lateralis, and the other 
distally from the anterior surface of the glossopharyngeus 
proximally into the inner surface of the ramulus amp. post. 
acustici. The nature of these branches could not be deter- 
mined from macroscopic examination. 
c. Nervus Lineae Lateralis Vagi. 
This nerve in 14 mm. specimens arises close to the root of 
the glossopharyngeus, slightly above and in front of that root 
and slightly behind the root of the acusticus. It seems to 
