164 A. SliDGWlCK. 



spicuous part of the nervous system of Balanoglossus, a similar 

 arrangement of a very complicated nature exists.^ They are 

 also present in the cephalic ganglia of the embryos of most 

 tracheate animals. 



' From an unpublislied research by Mr. W. Batesoii, of St. Jolm's College. 



