ipo NERVE COMPONENTS OF BONY FISHES. 



several branches. It is possible that some fibres pass 

 into the olfactory mucosa, though these could not be 

 demonstrated. 



The largest of these branches supplies the first canal 

 organ of the infra-orbital canal. Several branches pass 

 to the skin adjacent. Three of these were definitely 

 traced to naked sense organs lying between the anterior 

 and posterior nasal apertures {a. b. c). Finally a large 

 branch composed mostly of coarser and deeply staining 

 fibres passes mesad under the olfactory fossa and joins the 

 r. ophthalmicus superficialis V. The lattei; nerve is at 

 this point composed exclusively of fine general cutaneous 

 fibres, the coarse lateralis fibres of the r. ophthalmicus 

 superficialis VII having previously all separated from it. 

 The coarser fibres from the r. maxillaris can, therefore, 

 be separately followed with great ease after they have 

 joined the ophthalmicus superficialis. They soon again 

 withdraw and pass mesad to three large naked sense 

 organs on the top of the snout {d. e. f.), one just mesally 

 of the anterior nasal aperture, the others progressively 

 farther cephalad and mesad, so that these three organs, 

 together with the corresponding three of the opposite side, 

 form nearly a perfect semicircle from one anterior nasal 

 aperture to the other over the tip of the maxillary bone. 

 Some of these anastomosing fibres can be traced with 

 certainty to these three organs, but there are others which 

 seem to end free in the skin. This anastomosing branch 

 may carry some general cutaneous fibres. 



Five of the six naked organs of the snout supplied by 

 the r. maxillaris were found and their innervation traced 

 on the other side of this specimen. The positions of these 

 organs were also demonstrated in other series of sections 

 and in surface preparations of the skin of this region. It 



