© 08 
© 09 
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PLATE XII. 
The nerves dissected from the animal and enlarged. 
. Cerebral ganglia. 
. Commissural cord connect- 
ing cerebral ganglia. 
. Posterior ganglia. 
Commissural cord connect- 
ing the cerebral and pos 
terior ganglia. 
. Pedal ganglion. 
. Commissural cord connect- 
ing the pedal and cerebral 
ganglia. 
g.n. The nerve whose branches 
supply the gills. 
b.n. The nerves of that part of 
the mantle constituting 
the inhalent and exhalent 
siphons. 
.m. n. Anterior mantle nerve. 
p.- m. n. Posterior mantle nerve. 
au. s. Auditory sac. 
a. a.n. Anterior adductor nerve. 
p. h.n. Peripheral nerve. 
