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Soe cot a Come bomen 
Eis OF EIGURES IN TEXT 
Tracks 
Footprints of Chetrotheriwm 
Portion of a slab of new red sandstone with tracks 
Portion of a slab with tracks 
Footprints from the Connecticut sandstone 
Pterygotus anglicus . 
Silurian Merostomata 
Ichthyosaurus intermedius 
Teeth of Ichthyosaurus platyodon 
Skull of Ichthyosaurus latifrons 
Head of Ichthyosaurus platyodon 
Ichthyosaurus tenuirostris 
Mandibles of sea-lizards 
Plesiosaurus macrocephalus 
Magnified section of tooth of Labyrinthodon 
Skull of a Labyrinthodont, Mastodonsaurus Jegeri . 
Part of skeleton of a Labyrinthodont, Archegoswurus (Decheni) . 
Skull of Archegosawrus 
Labyrinthodonts. 1, a, b, Cricotus. 2. Head of Hryops . 
Skull of Zryops macrocephalus . 
Skeleton of a Labyrinthodont, Actinodon . 
A small Labyrinthodont, Ceraterpeton 
A snake-like Labyrinthodont, Dolichosoma 
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