LATERAL LINE SYSTEM OF CHIMERA COLLIEI 369 
upward towards the opening. The}' do not form the special 
group of mantle cells, noticed before in connection with the other 
type of canal; their sharp differentiation from the median cells 
is mainl}^ due, as has been said, to different staining properties. 
The free ends of all the columnar cells have a narrow, dark 
border, apparently a top-plate, t. Beneath the median cells is a 
fairly compact mass of fibrous tissue, /, through which are scat- 
tered numerous dark bodies, which seem to be small nerve trunks 
and individual nerve fibers, nv. 
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