LATERAL LINE SYSTEM OF CHIMERA COLLIEI 359 
former type will be referred to as ''type 1," the latter as ''type 2." 
Solger (79), in C. monstrosa, calls these two types of canals 
"primar}'" and " secondary forms, respectiveh^ 
As seen with the naked eye the canals of type 1 seem to be 
wide groov^es, bordered closely, on each side, by a dark line; but 
when examined under a low magnification it is seen that the slit- 
5 
Fig. 5 A surface view of a small portion of a canal of type 1; drawn under a 
low magnification of the microscope, by reflected light. 
Fig. 6 A small portion of two canals of type 2; drawn under a low magnifi- 
cation. Five of the wide spaces (iv), described in the text, are shown, as well as 
the shelf, and the round gland openings of the surrounding integument. 
like opening of the canal is much narrower than it appeared to the 
naked eye. That which gives the appearance of a wide opening 
is a border, on each side of the slit, where there is very little pig- 
ment. Beyond this light border there is, on each side, a very 
densely pigmented area that, at first glance, is taken for the edge 
of the slit. Fig. 5 represents a portion of a canal of type 1 as seen 
under a low magnification of the microscope. The dark narrow 
border on each side of the light area is more distinct when seen 
