A monograph of the Echinoidea. IV.2. Clypeasteroida. Clypeasteridæ, Arachnoidæ, Fibulariidæ, Laganidæ and Scutellidæ. Text
Mortensen, T. (1948). A monograph of the Echinoidea. IV.2. Clypeasteroida. Clypeasteridæ, Arachnoidæ, Fibulariidæ, Laganidæ and Scutellidæ. Text. C.A. Reitzel: Copenhagen. 471 pp.
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