Great Basin Naturalist


The new choristid demosponge, Loganiella johnsoni, is described from the upper part of the Lower Ordovician Garden City Formation of southeastern Idaho. The new sponge is a relatively thin walled, low, subcylindrical form. The skeletal net is composed of tracts of curved rodlike spicules, but details have been lost on all specimens because of extensive silicification. Impressions, however, suggest a close relationship to the choristid Dystactospongia Miller, 1889.