34 PISCES. 



1. First trunk of the fifth, formed of two parts. 



2. Branches of the second trunk of the fifth. 



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3. Third trunk of the fifth. 



4. Glosso-pharyngeal nerve. 



5. Trunk of the par vagum. 



6. Ventricular branch of the par vagum. 



7. Dorsal branch of the par vagum. 



8. One of the spinal nerves. 



9. Tlje branch of the spinal nerve passing to the muscles, &c., at the anterior or 



under surface of the body. All the other spinal nerves divide in a similar 

 manner, except that when several, as in the upper part, join together into 

 a trunk, part of the trunk thus formed passes to the anterior or under 

 surface, and then divides into branches as it does on the posterior surface. 



The glosso-pharyngeal nerve communicates with the portion of the auditory on 

 the sack of the labyrinth, and, after giving filaments to the surface of the first, and the 

 corresponding one of the second division of the gills, terminates on the membrane of 

 the mouth. This nerve, on being touched near its origin in a recently dead animal, 

 immediately produces a contraction of the muscular appendages of the gills. Does it, 

 therefore, communicate with the auditory nerve for the purpose of imparting con- 

 tractile power to the sack containing the cretaceous matter, or is it for allowing this 

 portion of the gills to receive sonorous impulses, and communicate them to the nerve 

 spread on the sack ? 



