J. Johnstone 
387 
In several other series of sections fixed with Zenker’s fluid and 
stained with methyl-blue-eosin a finer differentiation was obtained but 
the staining was then much more general and it became exceedingly 
difficult to trace the boundaries of the nerve tracts and centres, though 
details of structure became apparent. I have therefore reconstructed 
the nervous'system of the scolex from the former series, which although 
defective as regards the differentiation of the essential nervous elements 
still enables one to trace the locus of the organs. Fig. 5 is a projection 
of the dorsal half of the central nervous system in one horizontal plane, 
V 
