Classification of the Silurian Rocks. — Ludlow Formation and Fossils. —
Bone-bed of the Upper Ludlow. — Lower Ludlow Shales with Pentamerus. —
Oldest known Remains of fossil Fish. — Table of the progressive
Discovery of Vertebrata in older Rocks. — Wenlock Formation, Corals,
Cystideans and Trilobites. — Llandovery Group or Beds of Passage. —
Lower Silurian Rocks. — Caradoc and Bala Beds. — Brachiopoda. —
Trilobites. — Cystideæ. — Graptolites. — Llandeilo Flags. — Arenig or
Stiper-stones Group. — Foreign Silurian Equivalents in Europe. —
Silurian Strata of the United States. — Canadian Equivalents. — Amount
of specific Agreement of Fossils with those of Europe.