Die Sigillarien der preussischen Steinkohlengebiete. I. Die Gruppe der Favularien (1887)

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Sigillaria cumulata var. nodosa; Sigillaria doliaris High resolution image	High resolution image	Sigillaria elegans emend. var. regularis; Sigillaria elegans var. regularis; Sigillaria elegans var. Brongniartiana; Sigillaria elegans var. tenuimarginata; Sigillaria Scharleyensis; Sigillaria elegans var. communis; Sigillaria elegans var. squamea High resolution image
High resolution image	Sigillaria Fannyana; Sigillaria Berendti; Sigillaria trigona; Sigillaria microcephala; Sigillaria capitata; Sigillaria germanica var Loretziana; Sigillaria germanica var. Datheana; Sigillaria germanica var. Ebertiana; Sigillaria elegans var. communis; Sigillaria subrecta; Sigillaria margaritata High resolution image	High resolution image