Reportof U. S. National Museum, 1897. Flint. 



PLATE 



FIG. 1. PSAMMOSPHAERA FUSCA BRADY.' SEEPAGE 268. 



<T, I'. Sections. 



FIG. 2. PSAMMOSPHAERA FUSCA BRADY, VAR. TESTACEA, NEW. SEE PAGE 268. 



a. Artificial Section. />. Accidental Section. 



