. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. LARVAL HATCHING OF A TERRESTRIAL CRAB 403 a pipette. This exchange of beakers was made during the dark phase under the illumination of a hand-held flashlight covered with red cellophane. Each female from which some embryos had been de- tached was also monitored, and the time of larval release recorded. The recording system consisted of a sensor unit (infrared source-receiver) and a controller unit with a photoelectric switch. The sensor unit was placed in the experimental room, and the controller unit was set outside the roo
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