"Dalmanites" was widespread during the Ordovician and Silurian.He was the author of "De narcoticis observations" (1816), "Förteckning paa Skrifter i medicinska vetenskaperna, samt i kemi och Naturalhistorie, utgifne i Sverige åren 1817, 1818 and 1819" (1820), "Om Palaeaderna, eller de så kallade Trilobiterna" (1827) and very many works on entomology.