Monographs in course of Preparation—contin ued. 
The Silurian Brachiopoda, by Mr. Davidson. 
The Post-Tertiary Mollusca, by Mr. J. Gwyn Jeffreys. 
The Cretaceous Mollusca (exclusive of the Brachiopoda), by the Rev. T. Wiltshire. 
The Purbeck Mollusca, by Mr. R. Etheridge. 
The Ammonites of the Lias, by Dr. Wright. 
The Fishes of the Old Red Sandstone, by Messrs. J. Powrie and E. Ray Lancaster. 
The Crag Cetacea, by Professor Owen. 
The Inferior Oolite Mollusca, by Mr. R. Etheridge. 
The Rhetic Mollusca, by Mr. R. Etheridge. 
The Liassic Gasteropoda, by Mr. Ralph Tate. 
MONOGRAPHS in course of Pustication :— 
The Crag Foraminifera, by Messrs. T. Rupert Jones, W. K. Parker, and H. B. Brady. 
Supplement to the Fossil Corals, by Dr. Duncan. ; 
The Echinodermata of the Oolitic and Cretaceous Formations, by Dr. Wright. 
The Fossil Merostomata, by Mr. H. Woodward. 
The Trilobites of the Mountain-Limestone, Devonian, and Silurian Formations, by Mr. J. W. 
Salter. 
The Eocene Mollusca, by Messrs. F. E. Edwards and S. V. Wood. 
The Belemnites, by Professor Phillips. 
The Reptilia of the Liassic Formations, by Professor Owen. 
The Pleistocene Mammalia, by Messrs. Boyd Dawkins and W. A. Sanford. 
