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under the eye. After leaving the frontal the canal is pro- 
tected only by the chain of very slender suborbital ossicles. 
the posterior of which are sometimes called postorbitals, 
and the last of which is attached to the frontal. These 
ossicles are much more conspicuous in the Cod. In one 
specimen examined there were 18 suborbitals on the ocular 
side. On the eyeless side the suborbitals are both fewer 
and larger, nor does the canal take such a wide sweep 
forwards, and is hence shorter (ep. fig. 29). It leaves the 
frontal in front almost exactly opposite the exit of the 
right infraorbital. From this point the canal extends 
forwards in a slight curve until it reaches the left 
lachrymal to which the first suborbital ossicle is attached. 
On the ocular side the lachrymal is quite distinct from 
the suborbital chain, and in the specimen examined the 
canal ended by a pore 11mm. behind and below the postero- 
ventral extremity of the lachrymal. On the eyeless side 
the canal passes on to the left lachrymal, on which it 
terminates. There were 5 suborbital ossicles on this side, 
but three of these were each divided into two. Traquair 
describes 13 on the ocular side, and 8 on the eyeless. In 
the sections the right infraorbital canal was not com- 
pletely developed, the first 7 sense organs being yet 
unenclosed in a canal, but lodged in small depressions of 
the skin. The supratemporal and infraorbital canals are 
therefore the last to be completed. The portion of the 
canal in line with the “ lateral line,” and innervated by 
the R. oticus facialis, contained 3 sense organs on the 
ocular side, to the last of which attention may be drawn. 
On the eyeless side anteriorly the canal courses down- 
wards, but after leaving the lachrymal it turns sharply 
backwards almost at right angles. The whole canal is 
completely developed on this side, and is more robust. 
Its anterior portion has fewer sense organs, but those it 
