MICROPAPILLAE IN SEA URCHIN EGGS*

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Abstract
Sea urchin [Psammechinus miliaris] eggs fixed in a glutaraldehyde calcium chloride mixture had dense micropapillae. If these structures were real, they were likely to be sites where a fusion with the spermatozoon could take place. They probably represent some kind of preparation artefact without a structural counterpart in the living state.