title: Annelid Ciliary Photoreceptors.
abstract: The photoreceptor cells of the tube-dwelling polychaete Branchiomma vesiculosum contain stacked disc-shaped membranous sacs which are the expanded and flattened outer membranes of cilia.
authors.forename: P A
authors.initials: PA
authors.lastname: Lawrence
authors.forename: F B
authors.initials: FB
authors.lastname: Krasne