828 LIAS OF ENGLAND AND WALES t 
and Mr. E. A. Walford at Banbury, Mr. J. Windoes at Chipping Norton, 
Mr. Beeby Thompson and Mr. W. D. Crick at Northampton, and Mr. W. D. 
Carr at Lincoln. From most of these sources, and from published lists of the 
species, materials have been gathered. 
With regard to the perplexing matter of synonymy, much help has been 
obtained from the British Museum Catalogues of Fossil Vertebrata, by Mr. R. 
Lydekker and Mr. A. Smith Woodward ; and also from the Catalogue of 
British Fossil Vertebrata, by Messrs. A. S. Woodward and C. D. Sherborn ; 
and the Catalogue of British Jurassic Gasteropoda, by Messrs. W. H. Hudles- 
ton and E. Wilson. The last-named Catalogue was issued after the List of 
Fossils was in type : and it has not been possible to fully revise the nomen- 
clature of the Gasteropods. 
The List of Fossils from the Yorkshire Lias, prepared by Mr. Fox-Strang- 
ways, and published in the Memoir on the Jurassic Rocks of Yorkshire, has 
also proved of great service in regard to the synonymy of the Invertebrata. 
That Memoir (Vol. II.) contains a list of many of the works in which the 
fossils are figured and described. 
The Ammonites are indexed under the generic name Ammonites, because 
confusion must have arisen if any attempt had been made to employ the 
sub-generic names. These names indeed may be of service to the specialist 
who confines his attention to Ammonites, but they are of biological, rather 
than geological importance. Some of the names indeed have been changed 
again and asrain since this Memoir was commenced, and many of the species 
unfortunately are so split up that the multitude of names is simply bewilder- 
ing, and they become of little or no service to the stratigraphical geologist. 
In some cases the same specific name has been applied to mutations of different 
sub-genera of Ammonites : a course much to be deprecated, for it is likely 
that, if accepted as new species, the names will eventually be replaced by others. 
An index to the sub-generic names of Ammonites is given. 
The Insects recorded from the Lias require revision ; many of the names 
given are on the authority of C. G. Giebel (Fauna der V r or\velt, 1856, Band 2, 
Abth. 1.). See also Scudder, Bull. U.S. Geol. Survey, No. 31, 1886, and 
No. 71, 1891. 
For figures of British Liassic Fossils, the student may consult Sowerby's 
" Mineral Conchology," the works of the Palseontographical Society, "The 
Yorkshire Lias " by Tate and Blake (1876), and Prestwicii's Geology, Vol. ii. 
It should be specially noted that the present Catalogue does not enumerate 
the whole of the Liassic fossils of England and Wales ; the species from York- 
shire are given in the Memoir by Mr. Fox-Strangways (above referred to), and 
only those Yorkshire fossils that occur in the country to the south of the 
Humber are mentioned in the following lists. To obtain a full record of the 
Liassic fossils of England and Wales, it will be necessary, therefore, to com- 
bine the Catalogue given by Mr. Fox-Strangways with that contained in this 
volume. 
