64 THOMPSON YATES LABORATORIES REPORT 
a ganglion, atrophy ; the ventral non-ganglionated roots, on the other hand, combine together to 
form the trunk of the hypoglossal nerve of the adult. The Macaque Monkeys [rhesus and sinicus) 
that I have examined have not shown any sign of this dorsal root. It is for that reason that, in 
Fig. 4 
Anterior borders, 
light broken line. 
Posterior borders, 
heavy dotted line. 
discussing the source of the sensory fibres distributed to the external auditory meatus, I have not 
considered the fibres attributable to the Xllth cranial nerve. Froriep and Beck could not find 
it either in the Prosimias or in the Cynomorphous Apes.* In the Cat the 1st cervical has a small 
but distinct ganglion in the canal in the atlas. 
* Loc. cit. 
