Note 197 — Chapter XVII
Reading edition
The organs which resemble those of the lateral line are the remarkable sense organs found by Eisig in the Capitellidæ (Mittheil. a. d. Zool. Station zu Neapel, Vol. 1); but I am not inclined to think that there is a true homology between these organs and the lateral line of Vertebrata. It seems to me probable that the segmentally arranged optic organs of Polyophthalmus are a special modification of the more indifferent sense organs of the Capitellidæ. The close affinity of these two types of Chætopods is favourable to this view.