LATERAL LINE SYSTEM OF CHTALERA COLLTEI 
353 
Extending in a dorso-median direction from its point of con- 
fluence with the lateral and orbital is a canal whose entire length 
is not more than one or two centimeters; it has been called the 
occipital (figs. 1, 2, oc). Along its anterior side is seen a number of 
the small glandular openings that were mentioned above. In one 
specimen was seen a small, Y-shaped branch (fig. 2, y), about one 
Fig. 2 A dorsal view of the head of C. coUiei, showing the arrangement of the 
cephalic canals. 
Fig. 3 A ventral view of the head of C. coUiei, showing the distribution of the 
canals. 
centimeter long, extending cephalad from the occipital canal of 
the right side. This was the only case of evident asymmetry in 
the arrangement of the canals that was seen. In C. monstrosa 
this canal has, as in the case of C. colliei, the appearance of being 
simply the continuation of the aural canal {au), while in Rhino- 
chimaera and Harriotta it extends cephalad in such a direction as 
to seem continuous with the cranial canal (cr). 
Extending across the top of the head, about half-way between 
the orbits and the dorsal spine, from the points of confluence of 
