REACTIONS OF THE CYPRID LARVÆ OF BARNACLES TO LIGHT WITH SPECIAL REFERENCE TO SPECTRAL COLORS

Abstract

It is well known that the larvae of barnacles as well as the larvae of almost all sessile marine organisms are, at times, sensitive to light and are either photopositive or photonegative. This fact has led to their use for experimental purposes, but the use of the larval forms of barnacles in such experiments has been confined to the earliest free swimming stage call the Nauplius. No records have been found of the use of the later larval stage, the cyprid larva in experiments with light. Since barnacles are the most important of the various types of