Phymosoma texanum, complete test
Bob Campbell Geology Museum Formation: Fredericksburg Formation; Goodland Ls.
Purple sea urchin test (Strongylocentrotus purpuratus)
Bob Campbell Geology Museum Modern; Donated: Z. Zuber.
Rhyncholampas carolinensis, the small test has an oval outline in plain view
Bob Campbell Geology Museum Formation: Santee Limestone.
Rhyncholampas gouldii, three tests with roughly circular outline
Bob Campbell Geology Museum Formation: Ocala Limestone.
Sea Urchin (Hardounia cf. florealis)
Bob Campbell Geology Museum 72 million years old; Donated: The Duncan Family.
Sea biscuit (Rhyncholampas carolinensis)
Bob Campbell Geology Museum Formation: Santee Limestone; Donated: Janice Lay.