168 BRODE. [VoL. XIV. 
alimentary canal form a part of the dissepiment, while those 
immediately below the strand extend back of the dissepiment, 
and many of them run to the body wall close to the large sense 
organ of the lesser band. There is a possibility that these 
muscles (Fig. 18, /./.as.) may correspond to the muscles of 
the lateral organs found by Eisig in the Capitellidae and by 
Meyer in Polyophthalmus. In the dissected specimen shown 
in Pl. XIV, Fig. 19, the connection between the nuclei and 
the muscle fibres may be seen, and also the position of the 
sense organs relative to the strand.. A frontal section is shown 
in Fig. 20, and a more highly magnified portion of the same in 
Big. 21. 
(c) Luterpretation of Previous Observations. 
Since the cells forming the “lateral line’ are without doubt 
muscle cells, it seems necessary to attempt an interpretation of 
the observations made by several workers who held to the 
nervous character of the structure. 
In the first place, all have said that it was in connection 
with the brain or commissure, but no one has figured a definite 
connection such as we should expect. Vejdovsky finds that 
- the cells may merge into the central nervous system or may be 
united to it by fine anastomosing fibres. I have been able to 
trace the cells up to, or forward of, the brain and have found 
fine muscle fibres extending from the brain to the lateral wall 
of the body near the “lateral line.’ Even should a nerve 
branch be found going to these cells, it would not prove that 
the cell cord was a nervous structure, but would rather indi- 
cate, as suggested by Hesse, the connection of the nervous 
system with the circular muscles. However, I do think the 
muscles are not all innervated from the ganglion in the head 
segment. 
Vejdovsky’s term “ ganglion cell”’ will hardly apply to these 
cells from what has been shown to be their true nature. 
Another point opposed to Vejdovsky’s view is that the cells 
have their long diameter at right angles to the cord, and not in 
the line with the cord (Pl. XIV, Fig. 19). 
