@inbook{Echinoidea:SourceID:3179, author = {Mortensen, T.}, title = {A Monograph of the Echinoidea. V, 1. Spatangoida I. Protosternata, Meridosternata, Amphisternata I. Palæopneustidæ, Palæostomatidæ, Aëropsidæ, Toxasteridæ, Micrasteridæ, Hemiasteridæ, 432 pp., C. A. Reitzel, Copenhagen.}, url = {https://marinespecies.org/echinoidea/aphia.php?p=sourcedetails&id=3179}, year = {1950} }