Type material for 116 nominal species of fossil archaeocyathids, poriferans, receptaculitids and stromatoporoids are in the Invertebrate Paleontology Collections of Yale University's Peabody Museum of Natural History. Primary types for 66 nominal species include 51 holotypes and 26 syntypes (representing 15 nominal species). Secondary types for 13 nominal species include 51 paratypes. Tertiary types for 56 nominal species include 174 hypotypes. Most types are from Newfoundland, Quebec, Kentucky, New York State, and Tennessee and have been described by C.E. Beecher, G.H. Girty, James Hall, W.A. Parks, and W.H. Twenhofel.