1896. ] NEW YORK ACADEMY OF SCIENCES. 181 
sacculus. This ramulus branches and spreads over the ventral 
wall of the sacculus. Part of the fibres of this ramulus extend 
to the papilla acustica lagen. From about the middle of the 
ramulus posterioris (1. p. a., Fig 2) and directly under the an- 
terior part of the connecting tube of the posterior canal (p.c. t.), 
two small branches are given off, the ramuli of the macula neg- 
lecta(m. n.). These ramuli pass upward to the connecting tube 
of the posterior canal. The larger ramulus clasps the upper 
side of the tube with brush-like endings. The smaller ramulus 
clasps the under side and the fibres of the two interlace. The 
other main branch of the auditory nerve turns upward toward 
the recessus utriculus and branches, sending off the ramulus re- 
cessus to the ventral wall ofthe recessus utriculus. A little be- 
yond, the main branch divides and sends ramuli to the ampulle 
of the anterior and horizontal canals. 
BIOLOGICAL LABORATORY, 
NEw YORK UNIVERSITY, May, 1896. 
EXPLANATION OF THE FIGURES. 
REFERENCE LETTERS. 
Ss. Sacculus. 
u. Utriculus, 
ue Recessus utriculus. 
1 Lagena. 
c Anterior Canal. 
ce. Posterior Canal. 
h.c. Horizontal Canal. 
a Anterior Ampulla. 
a. Posterior Ampulla. 
h.a. Horizontal Ampulla. 
d. end. Ductus endolymphaticus. 
d. c. p. Ductus canalis posterioris. 
p. c. t. Connecting tube of the posterior canal. 
sin. u. Sinus utriculus. 
uP Line of depression between s. and u. 
a.t. Ampullar tube. 
n. Auditory Nerve, 8th Cranial Nerve. 
r. p. a. Ramulus to posterior Ampulla. 
m.n. Macula neglecta. 
PLATES XII., XIII., Fras. 1-5. Show different views of the complete mem- 
branous ear of the right side. Fic. 6, View of the canals and their relation 
to the brain and eye. 
Fic. 1. The membranous ear as seen from the outside at nearly right 
angles to the side of the head and a little above. It shows the shape and po- 
sition of the sacculus (s.), utriculus (u.), lagena (1.) and their relation to 
each other: also the position of the ampullze with respect to the canals and 
the recessus utriculus (r. u.). d.c¢. p. represents the small connecting tube 
between the connecting tube of the posterior canal (p. ¢c. t.) and the saccu- 
lus (s. ). 
