NERVOUS SYSTEM OF A TWO-HEADED PIG EMBRYO 393 



T3.sy.- 



Ts.sy.ac. 



Fig. 7 Cervical sympathetic nervous sj^stem. A semi-diagrammatic draw- 

 ing from the model showing the cervical sympathetic nervous system in relation 

 to the neighboring cranial and spinal nerves. 



Fig. 8 Section through the conjoined metencephalon (the 'metencephalic 

 mound'). S. 96. 



Fig. 9 Section through the conjoined fourth ventricle, the median eyes, and 

 the forebrains of heads A and R. S. 163. 



THE JOURNAL OF COMPARATIVE NEUROLOGY, VOL. 32, NO. 4 



