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Rhynobrissus cuneus Cooke, 1957, p. 10

Diagnostic Features	Like R. pyramidalis but the petals are proportionately longer. The two species are markedly different in vertical profile; R. pyramidalis has a posterior face that slopes backwards whereas R. cuneus has a near vertical posterior face.
Distribution	North Carolina, USA.
Type	USNM E8032 (holotype).
Classification and/or Status	A species of Rhynobrissus
Remarks	Cooke, C. W. 1957. Rhynobrissus cuneus, a new echinoid from North Carolina. Proceedings of the United States National Museum 107, 9- 12.