The Natural Canvas Fossils / 0909 Fossil Echinoderms - Echinoids, Crinoids, Cystoids, Carpoids, Starfish and other extinct forms Purchase here: ncanvas@aol.com

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Pentremites robustus

Mississippian, Indiana, USA

Very good, very big 1.3" blastoid. Good for display or as a spare golf ball. One of the largest blastoids we have seen.

$16