A monograph of the Echinoidea. V. 2. Spatangoida. II. Amphisternata II. Spatangidæ, Loveniidæ, Pericosmidæ, Schizasteridæ, Brissidæ. Text
Mortensen, T. (1951). A monograph of the Echinoidea. V. 2. Spatangoida. II. Amphisternata II. Spatangidæ, Loveniidæ, Pericosmidæ, Schizasteridæ, Brissidæ. Text. C.A. Reitzel: Copenhagen. 593 pp.
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