trigonotreta

Updated: March 16, 2026

There are 25 Gasteropods and only one cephalopod, Nautilus Freieslebeni, which is also found in the German Zechstein. Spirifera alata, Schloth. Syn. Trigonotreta undulata, Sowerby., King's Monograph. King and Howse.

Sir Charles Lyell - The Student's Elements of Geology