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Heliodiscus echiniscus Haeckel, 1887

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Disk with spiny surface, three times as broad as the medullary shell. Pores irregular, roundish or polygonal, eight to ten on the radius. Marginal spines thirty to fifty, pyramidal, angular, of very variable size, number, and disposition, gradually passing into the surface-spines; the largest nearly as long as the diameter of the medullary shell.
Dimensions.—Diameter of the disk 0.14, of the medullary shell 0.045; length of the radial spines 0.02 to 0.04, basal breadth 0.006.
Haeckel 1887











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