This bibliography of 1,649 published references summarizes the progress of study and the history of changing ideas and concepts about receptaculitids, a class of algae composed of Receptaculitales, Cyclocrinitales, and Radiocyatales. All systematic descriptions, and all major stratigraphic and geographic occurrences of receptaculitids are believed to be included. Each entry is accompanied by an abstract consisting of objective data on description, illustration, discussion or listing of the receptaculitid paleontology, and stratigraphy Includes bibliographical references (p. 4-215) This bibliography of 1,649 published references summarizes the progress of study and the history of changing ideas and concepts about receptaculitids, a class of algae composed of Receptaculitales, Cyclocrinitales, and Radiocyatales. All systematic descriptions, and all major stratigraphic and geographic occurrences of receptaculitids are believed to be included. Each entry is accompanied by an abstract consisting of objective data on description, illustration, discussion or listing of the receptaculitid paleontology, and stratigraphy Fieldiana series has been published as Geological Series by Field Columbian Museum (1895-1909) and Field Museum of Natural History (1909-1943), and as Fieldiana: Geology by Chicago Natural History Museum (1945-1966) and Field Museum of Natural History (1966-1978). Fieldiana Geology New Series No. 1 began June 29, 1979