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termination but it is deep seated within the brain substance. Within 
the farrow and on the front surface of the brain the median nerve 
is flattened, and is composed of two or more distinct bundles of fila 
united within the same envelope of connective tissue. It becomes 
rounded in cross-section as it traverses the space between brain and 
olfactory lobe. 
a. NV 
_mb 
Fig. 8. X about 61/, diameters. 
The new nerve (nv) after crossing obliquely about ?/, the dia- 
meter of the lobe, enters the connective tissue at the base of the ol- 
factory cup. Just where it disappears in the Fig. the nerve begins 
to divide very unequally into branches which pass downwards and 
laterally. The largest of these branches unites with the outer bundle 
of the main olfactory as in earlier stages. Actual anastomosis has 
not been noticed but the fibres of the median nerve mingle very in- 
timately with those of the main olfactory. Together they pass be- 
tween the folds of the nasal membrane and into the epithelium some 
of the fibres of the median nerve reach the extreme antero-lateral 
portion of the olfactory cup, others terminate more centrally. 
Fig. 9 represent the brain of a half grown Acanthias about 
