352 
A. M. REESE 
describes nor figures the lateral canal in the fourth genus of the 
group, Harriotta, and the figures of Dean ('06) and of Jordan and 
Evermann COO) are so small that the exact course of the canal 
is difficult to determine. Its anterior bend seems, however, to be 
about the same as in C. colliei, while its posterior portion, along 
the ventral edge of the body seems to be due rather to an upward 
tendency in the ventral outline of the body than to a downward 
bend in the lateral line itself. 
The cephalic system of canals is very complicated but, as might 
be expected, is quite uniform in arrangement in individuals of 
the same species, though some variations are noticed. 
None of the cranial canals has the appearance of being a direct 
continuation of the lateral canal, but the orbital (fig. 1, or) most 
nearly approaches this condition. It begins one to two centimeters 
back of the orbit, where it is continuous with the lateral (1) and 
the occipital (oc). Extending cephalad and ventrad it gives off, 
or unites with, two canals, the angular (an) and the jugular (j), 
Sit a point about one centimeter below the eye, and continues 
cephalad as the suborbital (so). The course of the orbital is 
about the same in all the Chimseroids. 
The suborbital (figs. 1, 2, and 4, so) is a direct continuation of 
the orbital. It passes cephalad and dorsad to a point about 
half-way between the orbit and the tip of the snout ; there it makes 
a wide bend downward and continues cephalad to unite with the 
rostral (r) and subrostral (sr) . In the region anterior to the bend 
just mentioned the subrostral canal has a series of five or six 
enlargements that will be described later. Along the concave 
side of the bend and in the angle between the suborbital and the 
angular is seen a number of small, round, glandular openings. In 
C. monstrosa and in Callorhynchus this canal follows about the 
same course as has just been described, except that, in the latter 
form, the bend is not so marked. In Rhinochimsera and Harriotta 
the bend is less marked and the anterior region is longer, because 
of the greater length of the snout in these two forms. The enlarge- 
ments in this region of the canal are also wanting in these two 
species, so far as can be determined from the figures of Garman 
('04), Dean ('95), and Jordan and Evermann ('00). 
