I20 NERVE COMPONENTS OF BONY FISHES. 



large naked cutaneous sense organ which lies just above 

 and in front of the pore at the union of the supra- and infra- 

 orbital canals. The smaller portion turns abruptly dor- 

 sad under the skin {a. r. VII. i of Fig. 4) and joins 

 the main trunk of the r. lateralis accessorius near the 

 median line, as shown on Fig. 3. The branch which sup- 

 plies the sense organ contains slightly larger fibres than 

 the one which joins the r. accessorius, many of the former 

 being 3 micra in diameter, while the latter rarely exceed 

 2 micra. This organ is, I think, a terminal bud, though 

 it may be a free organ of the lateral line series. Another 

 similar organ was found on the opposite side of the speci- 

 men plotted and in a second specimen, lying less than 

 I mm. cephalad and somewhat laterally of the upper end 

 of the occipital commissure of the lateral line canal. Its 

 innervation could not be determined. 



The very brief reference to the r. supra-temporalis in 

 my Anzieger preliminary ('97, p. 427) has given rise to a 

 misunderstanding. Cole (98a, p. 185) interpreted this as 

 implying that the r. supra-temporalis for the canal organs 

 m. 2 and vi. ^ is a r. supra-temporalis IX. As a matter of 

 fact the glossopharyngeus has no r. supra-temporalis in 

 Menidia. 



2. — TJie First Lateral Raimihis. 



The first nerve given off from the r. lateralis behind its 

 ganglion {r. I. /, Figs. 3 and 5) supplies the first organ of 

 the lateral series behind the occipital commissure, viz., 

 the single organ contained in the post-occipital canal. It 

 contains a few fine fibres among the coarse ones. The 

 latter are not as large as some lateralis fibres, being from 

 5 to 7 micra. These supply the canal organ, while the 

 fine ones, which are about 3 micra in diameter, separate 



