INTERREEF CRINOID FAUNA FROM THE MISSISSINEWA SHALE MEMBER OF THE WABASH FORMATION (NORTHERN INDIANA SILURIAN ECHINODERMATA)

A true interreef crinoid fauna lacking components of reefal facies is reported from the Ludlovian of the Mississinewa Shale Member of the Wa bash Formation in northern Indiana. The Mississinewa facies that conta ins this fauna is a dolomitic siltstone or a silty dolomite. The crino id association reported is composed entirely of new species and is dif ferent from other reef and reef-associated, interreef, and non-reef cr inoid associations. New species described, herein, include the followi ng: Dimerocrinites (Eucrinus) ankylos n. sp., Periechocrinus shaveri n . sp., Bohemicocrinus? occidens n. sp., Macrostylocrinus styo n. sp., M. homalos n. sp., Gissocrinus hypselos n. sp., and Dendrocrinus diaph oros n. sp. This may be the first occurrence of Bohemicocrinus from ou tside Bohemia.