INVERTEBEATA. 



PLATE I. 



DORSAL ASPECT OF THE CRAB. 



(CANCER PAGURTS.) 



THE brain is seen giving off the nerves to the eyes and contiguous parts, and 

 sending a long nerve on each side of the oesophagus, to supply filaments to the 

 stomach and branchiae, and pass backwards to join the nervous ring. The con- 

 tinuation of the nerves given off by the nervous ring to the legs is also exhibited. 

 The nervous system in the fresh animal is very transparent. 



