A new spatangoid echinoid, Archaeopneustes moorefieldi n. sp., is described from moderately deep (150 to 300 feet) or deep water-deposited Pliocene sediments [Pismo Formation] exposed in Castro Canyon, western San Luis Obispo County, Calif. Mr. J. R. Moorefield discovered this large echinoid and kindly donated it to me. It is now in the type collection at UCLA. Although the fossil is not perfectly preserved its unique occurrence in the Neogene stratigraphy of California warrants description.

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