192 MAMMALIA. 



FIG. II. 



THE CAUDAL NEEYES OF THE CALF. 



(BOS TAURUS.) 



1. PROLONGATION of the sympathetic nerve ; in descending it is connected with 



the lumbar, sacral, and caudal ganglia, and, with the prolongation of the 

 left side, forms the single ganglion about the middle of the third caudal 

 vertebra ; this ganglion gives off two branches to unite a little lower down 

 into one, and pass with and distribute filaments on the caudal artery. 



2. Anterior caudal nerve ; it is formed of branches from the anterior trunks of 



the lower sacral and caudal nerves after they have communicated with the 

 sympathetic ; it gives off branches to the muscles and skin in its passage. 



3. Posterior caudal nerve ; it is formed of the posterior trunks of the lower sacral 



and caudal nerves, and passes down, giving branches to the muscles and 

 skin. 



FIG. III. 



THE SPINAL CORD OF THE HEDGEHOG. 



(ERINACEUS EUROP^EUS.) 



THE spinal cord is short and thick, and terminates in a point about the sixth 

 dorsal vertebra. 



