166 
The condition of this recurrent canal, it may be men- 
tioned, varies considerably. On the eyeless side the rela- 
tions of the supratemporal canal to the ossicles was essen- 
tially the same. The sections revealed a curious absence 
of sense organs in the anterior portion of the supra- 
temporal canal of the ocular side (fig. 23), there being only 
4 sense organs as against 15 pores, but the canal on both 
sides of the body was not completely developed, like the 
infraorbital. On the eyeless side in the sections there 
was a break in the middle of the supratemporal canal 
occupied by three naked sense organs, only two of which, 
however, seemed to be canal organs. This break is of 
course converted into a canal later on in the ontogeny. 
The recurrent canal was also absent, and there were only 
eight pores as against 13 on the ocular side, although 
there were at least 7 sense organs as against 4, not count- 
ing the three naked sense organs above. The relative 
position of the sense organs was also different. In the 
lateral line itself the only difference of importance 
between the two sides was that the third or last otic sense 
organ of the ocular side was here innervated from the R. 
supratemporalis vagi, and hence belonged to the lateral 
canal, as in the Cod. 
Infraorbital Canal (inf. c.).—After leaving the last 
supratemporal ossicle, in which this canal on the ocular 
side anastomoses with the lateral, it at once enters the 
pterotic, and immediately receives the hyomandibular 
canal, which comes up from below. There is no separate 
dermal pterotic as occasionally occurs in the Cod. The 
canal passing straight forwards, traverses the pterotic, 
sphenotic and right frontal. Arrived at the space between 
the first and second tuberosities (fig. 1) it anastomoses 
with the right supraorbital canal and turns sharply down- 
wards almost at right angles, afterwards curving forwards 
