LATERAL LINE SYSTEM OF CHIALERA COLLIEI 357 
it turns under and inward to cross the wing and meet the angular 
of the other side" ('88, p. 75). A very clear idea of the course 
of this canal cannot be had from this description, and the figures 
of neither Garman nor Dean, make the matter any plainer. It is 
evident, however, that the course of the canal is quite different 
in Callorhynchus from what is seen in the other Chimaeroids, 
especially in that it is entirely distinct from the oral and, appar- 
ently, from the nasal and subrostral. 
The oral canal (figs. 1, 3, o) arises from the ventral side of the 
angular at the point where the latter, as has been said, makes 
its sudden turn towards the head. It passes ventrad and cephalad, 
in a gentle curve, like a reversed letter S. Passing under the 
throat, one or two centimeters caudad to the mouth, it meets 
its fellow in the mid-ventral line. Like the jugulars, the ventral 
ends of the orals, where they cross the throat, are broken up into 
a series of short dashes (fig. 3, o), instead of having the continuous, 
groovelike form seen elsewhere. Along the anterior border of 
the dorsal curve of the oral may be seen a row of about a dozen 
pores ; they follow the direction of the canal until they reach the 
labial folds, then they turn cephalad and pass around the anterior 
end of the head, between the nostrils and the nasal canals (figs. 
1, 3, 4), becoming smaller as they pass forward. In C.monstrosa, 
Rhinochimsera and Harriotta the course of the oral is the same as 
in the present form, but in Callorhynchus it arises from the orbital, 
just posterior to the angular. 
The nasal canal (figs. 1, 3, 4, n) arises from the ventral side of 
the angular in its anterior half. It passes ventrad and cephalad 
for a short distance and then turns sharply cephalad to meet its 
fellow in the median line, about half way between the nostrils 
and the point of union of the angular canals with the median 
subrostral. Throughout its length the outline of the nasal is 
broken by a series of enlargements like those already noted in 
connection with the rostral, suborbital, and angular canals. As 
has been noted above, Garman calls that part of the angular which 
lies anterior to the origin of the nasal the subrostral, but there 
seems to be no reason for so doing. The course of the nasal canal 
in C. monstrosa is, apparently, the same as in C. colliei. Its course 
