102 
IOWA ACADEMY OF SCIENCES. 
RtV , root of trigeminal nerve. 
RtVII-VIII , auditory-facial nerve root. 
RtlX-X, roots of glossopharyngeal — vagus nerves. 
RtlVII, lateralis root of facial nerve. 
1, 2, 3 Sp , first, second and third spinal nerves and ganglia. 
VG, vagus ganglion. 
