A monograph of the Echinoidea. V. 1. Spatangoida. I. Protosternata, Meridosternata, Amphisternata I. Palæopneustidæ, Palæostomatidæ, Aëropsidæ, Toxasteridæ, Micrasteridæ, Hemiasteridæ. Text and plates
Mortensen, T. (1950). A monograph of the Echinoidea. V. 1. Spatangoida. I. Protosternata, Meridosternata, Amphisternata I. Palæopneustidæ, Palæostomatidæ, Aëropsidæ, Toxasteridæ, Micrasteridæ, Hemiasteridæ. Text and plates. C.A. Reitzel: Copenhagen. 432, XXV plates pp.
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