A new hydrozoan from the Pennsylvanian of Illinois

Description

Drevotella proteana, a new genus and species of colonial hydrozoan, is described from the Middle Pennsylvanian Francis Creek Shale of the Mazon Creek area of northeastern Illinois. It is represented by numerous specimens preserved in iron-stone concretions in which the large, irregularly branched colonies appear as flattened impressions visible by virtue of color contrast.