540 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 
B. (3) The Anterior Infundibular Nerve is given 
off from the ventral surface of the brain, at about its 
median point (fig. 70, Ant. Mun. N.).  It'is exterior to 
the nerve of the anterior vena cava and ventral to the 
auditory nerve. ‘This nerve pierces the ventral wall of 
the cranial cartilage (fig. 69) anterior to the statocysts. 
Between the two anterior infundibular nerves is an oval 
aperture, through which the two forks of the anterior 
aorta leave the central cavity of the brai, and 
reach its ventral surface (see arterial system in 
Section IV). Just before the nerve leaves the 
cranial cavity it gives off a fine branch which 
leaves this cavity by an independent hole, and runs 
to the protractors of the funnel on that side. After 
leaving the cranial cavity the anterior infundibular nerve 
gives off a second branch which supplies the posterior 
dorsal wall of the funnel. Some of its branches run to 
the wall of the lateral funnel chamber. Soon after, the 
nerve gives off a third branch to the funnel. This ends 
in several branches which run to the median wall of the 
funnel. The ‘anterior infundibular nerve runs on 
anteriorly, and soon bifurcates, both halves entering the 
funnel wall, and both supplying eventually the dorsal 
wall of the funnel. The lower of these two branches 
soon swells into an oval ganglion, which is about as large 
as the smaller of the two ganglia on the course of the 
visceral nerve. From the anterior end of this ganglion 
several branches run, with the strands from the upper 
branch, to the dorsal wall of the funnel. The ultimate 
fine branches in which all these infundibular nerves end 
form a complete anastomosing network which quite 
surrounds the funnel walls. 
R. (4) The Posterior Infundibular Nerve runs out 
from the brain just exterior to the corresponding visceral 
