ABBREVIATIONS. 



Hypodermis. 

 Leucocytes. 

 Basement membrane. 

 Mitome. 



Circular muscles. 

 Neuroglia. 

 Neuroglia nucleus. 

 Nerve of retractors. 

 Nucleus of sensory cell. 

 Splanchnic nerve. 

 Tentacular nerve. 

 Cerebral organ. 

 Mouth. 

 Paramitome. 

 Papilla. 



Tentacular fold. 

 . Dermal nerve plexus. 

 Digitate processes of brain. 

 Glandular branch of plexus. 

 Muscular " " 



Sphincter of cerebral canal. 

 Dorsal blood-vessel. 

 Ventral bloodvessel.. 

 Smooth zone of introvert. 

 Anterior papillate zone of 



introvert. 

 Posterior papillate zone of 



introvert. 



