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Melonechinus is an extinct genus of echinoid that lived in the Carboniferous. Its remains have been found in North America. Fossils (Smithsonian Handbooks)...

†Llanoaspis – tentative report †Manitoulinoceras †Marsupiocrinus †Martinia †Melonechinus †Meristella †Meristina †Microplasma †Mucrospirifer †Mucrospirifer mucronatus...

Megacidaris Megapetalus Megapneustes Megaporocidaris Mellita Mellitella Melonechinus Menocidaris Menopygus Menuthiaster Meoma Mepygurus Merocidaris Merriamaster...

expansus †Melocrinites †Melocrinites aequalis †Melocrinites oblongus †Melonechinus †Mendacella †Mendacella circulus †Meniscophyllum †Meniscophyllum minutum...

†Megaporocidaris †Megistocrinus †Melbacrinus †Mellita †Mellitella †Melocrinites †Melonechinus †Menniscocrinus †Menocidaris †Menopygus †Menuthiaster †Meoma †Mepygurus...