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into two and these are distributed to the lateral medial portions 

 of the sub-esophageal mass of the nervous system. The trachea 

 within the nervous system are not as abundant as in insects. 

 Long tracheoles pass through the brain and ganglion as straight 

 or slightly curved lines. There is no branching or anastomosis. 



Figure S'. Diagram of the traclieal supply to tlie central nervous system of Chelifer 

 scabisciilus. XSO. 



The paper by Allen '04 on the anatomy of one of the Acarina is 

 the only one I have found referring to the tracheae in the central 

 nervous system of Arachnida. 



Sense Organs and Peripher^vl Nerves. Scattered or grouped 

 sensory hairs are found over the surfaces of the body, especially 



