“Sphaerocodium,” misinterpreted fossil from the Wenlock Limestone

The two species of Sphaerocodium recorded by Rothpletz from the Wenlock Limestone of the Baltic are shown to be symbiotic intergrowths of varied encrusting creatures. A new genus of calcareous algae, Rothpletzella, is proposed to include the more striking of the forms described by that author, and another new genus, considered to belong to the Foraminifera, is erected to include a second organism common in these composite nodules. This form, Wetheredella, was described and figured by Wethered in 1893, but has been overlooked for many years.