Classification of the Cambrian Group, and its Equivalent in Bohemia. —
Upper Cambrian Rocks. — Tremadoc Slates and their Fossils. — Lingula
Flags. — Lower Cambrian Rocks. — Menevian Beds. — Longmynd Group. —
Harlech Grits with large Trilobites. — Llanberis Slates. — Cambrian
Rocks of Bohemia. — Primordial Zone of Barrande. — Metamorphosis of
Trilobites. — Cambrian Rocks of Sweden and Norway. — Cambrian Rocks of
the United States and Canada. — Potsdam Sandstone. — Huronian Series. —
Laurentian Group, upper and lower. — Eozoon Canadense, oldest known
Fossil. — Fundamental Gneiss of Scotland.