2 Journal of Comparative Neurology. 



which were bordered by skin. Some well developed curly hair 

 covered the skin surrounding the substantia medullo-vasculosa. 

 In the gaping vertebral canal was a quantity of longer or short- 

 er tangled threads, of various degrees of fineness, filling the ca- 

 nal. They sprang from oval formations situated in the in- 

 tercostal spaces. These oval formations were nothing other 

 than the spinal ganglia and the threads referred to — the dorsal 

 roots of the spinal cord into the dorsal part of which they 

 seemed to be directed. These spinal ganglia also possess peri- 

 pheral roots representing the peripheral nervous system. There 

 were nine ganglia on the right side and ten on the left. After 

 the most minute examination there were discovered on the left 

 side under the occipital bone three little ganglia connected with 

 each other. One root went from the inferior ganglion without 

 passing through the foramen ischiadicum majus and terminated 

 on the surface of the glutasus majus. Some roots arising from 

 certain of the ganglia passed through this foramen and, passing 

 towards the muscles of the lower extremities, united with the 

 root of the inferior ganglion to form a sciatic nerve. Other gan- 

 glia gave rise to roots which were directed towards the inter- 

 costal spaces. The last superior ganglia formed the plexus 

 brachialis. Ventral roots absent, hence also motor fibres. In 

 spite of this the striated muscles of the body were normally de- 

 veloped, a fact of great scientific interest, especially to the 

 physiologist. 



As to the sense-organs, ear and eye normally developed ; 

 the optic nerve terminating simply in the substantia medullo- 

 vasculosa. In the microscopic examination a normal human 

 embryo of eight months about as long as the monster served as 

 a control. The transverse and horizontal dimensions of the 

 spinal ganglia were less in the pathological case than in the nor- 

 mal, but this is wholly due to the absence of the motor fibres. 

 In the monster the quantity of fibres was less, as shown by the 

 less intense coloring with haematoxylin, and the whole section 

 was covered with a granular mass. On the lateral side of the 

 sections some empty oval formations look like the neurilemma 

 of the absent motor bundles. The brachial plexus shows the 



