Note 293 — Chapter VII · ORGANS OF SENSE: TOUCH, SIGHT, SMELL, HEARING—THE FOOT—THE NERVOUS SYSTEM
Reading edition
The nature of the grouping of the eyes into rows varies considerably in different species. As a rule, the rows radiate from the beak, but occasionally they run parallel to the girdle. In Tonicia lineolata Fremb., they are grouped, as it were, under the shelter of strongly marked longitudinal wavy lines.