Eiffelia
Eiffelia is an extinct genus of sponges known from the Middle Cambrian Burgess Shale as well as several Early Cambrian small shelly fossil deposits. It is named after Eiffel Peak, which was itself named after the Eiffel Tower. It was first described in 1920 by Charles Doolittle Walcott. It belongs in the Hexactinellid stem group. "Eiffelia" generally have star-shaped six-rayed spicules, with rays diverging at 60°, occasionally with a seventh ray perpendicular to the other six. Species. Two species are known: