1. The effect of temperature on the photosensory latent period in Pholas dactylus is accurately described by the Arrhenius equation when µ = 18,300.

2. The adequacy of this equation has already been found for two other photosensitive animals, Mya and Ciona, which are very similar in behavior to Pholas. The value of µ is different for each of the three species studied.

3. This is taken to mean that though the organization of the receptor process is the same for the three species, the chemical materials concerned are very likely different.

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