`The book is well edited. Suitable cross-references highlight similarities and differences of viewpoint between the various authors...Well produced, with very good illustrations and three types of index...Palaeontologists should be acquainted with this book and it deserves to be in every geological departmental library.' Geological Magazine
Stefan Bengtson: Introduction: the problem of the Problematica; Jack A Babcock: The puzzle of the alga-like Problematica, or rummaging around in the algal wastebasket; Matthew H Nitecki: Receptaculitids and their relationship to other problematic fossils; Andrey Yu Zhuravlev: Radiocyathids; Ellis L Yochelson & Richard H Lindemann: Considerations on systematic placement of the styliolines (Incertae sedis: Devonian); Mikhail A Fedonkin: Precambrian problematic
animals: their body plan and phylogeny; George D Stanley Jr: Chondrophorine hydrozoans as problematic fossils; A Yu Rozanov: Problematica of the Early Cambrian; Stefan Bengtson, S Crosbie Matthews, & Vladimir V Missarzhevsky: The Cambrian netlike fossil; Jerzy Dzik: Turrilepadida and other Machaeridia; Loren
E Babcock & Rodney M Feldmann: The phylum Conulariida; Barry D Webby: Early stromatoporoids; Derek E G Briggs & Simon Conway Morris: Problematica from the Middle Cambrian Burgess Shale of British Columbia; Adam Urbanek: The enigma of graptolite ancestry: lesson from a phylogenetic debate; Richard J Aldridge & Derek E G Briggs: Conodonts; Jerzy Dzik: Chordate affinities of the conodonts; Indexes.