JOTJKNAIi OF ENTOMOLOGY AND ZOOLOGY 



39 



In Xenylla the ganglia are mucli like those in Aphorura 

 previously described. The supraesophageal ganglion is con- 

 tinued towards the antennae on either side and these lobes are 

 well covered with nerve cells on the surface. The lateral por- 





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Q. 



The figure at the top is a longitudinal section through the central nervous system 

 of Xenylla. 1 and 6 are the head ganglia; -2, 3 and i are the body ganglia; 5 is a 

 section of the last ganglion at another level. The dorsal side is up. I'nder 1, 

 from A to S, are drawings of cross sections from another series through the head 

 ganglia at intervals in the nervous system of 5 microns. The dorsal side is u]). 

 Under -2, there are similar sections shown from the first thoracic ganglion of the 

 same series. The sections run from A to H, every 5 microns. L'nder 3 and 4 

 continuations of the same series are given through the two lower ganglia in the 

 same way. The dorsal side is up and all figures are drawn to the same scale, which 

 is X 200.' 



