Geologjf' 

 Library 



PEEFACE. 



THE study of the Neocomian faunas of Cambridgeshire and 

 Bedfordshire has occupied much of my time for some years past. 

 I have had the advantage of watching the course of the 'coprolite' 

 workings from their beginning in 1866 up to the present time, 

 and have constantly been familiar with the large collections that 

 have been made by the Woodwardian Museum, by Mr J. F. Walker 

 of Sidney Sussex College, Mr E. Earwaker of Merton College, 

 Oxford, and other Geologists. 



In the comparison of the fossils with known species it has 

 always been my endeavour to see the original or, failing that, some 

 typical specimen, and to trust as little as possible to bare figures 

 and descriptions. In this work I am much indebted to a number 

 of Geologists for their kind assistance, for the loan of specimens, 

 &c., amongst whom I must particularly mention Mr J. F. Walker, 

 M.A., F.G.S., Mr C. J. A. Meyer, F.G.S., Mr J. J. Harris Teall, 

 M.A., F.G.S., Mr E. C. Davey, F.G.S. of Wantage, and Mr T. 

 Davidson, F.R.S. of Brighton. In continuing the same work of 

 comparison and identification through Holland and Germany I 

 had the advantage of Professor Judd's Paper 1 as an admirable 

 guide, and I am much beholden to Professors Marten of Leiden, 

 R. Lepsius of Darmstadt, Ulrich of Hanover, and Geinitz of Dres- 

 den, and other German Geologists for their kindness and valuable 

 help. 



1 " On the Neocomiau strata of Yorkshire and Lincolnshire, with notes on their 

 relations to the beds of the same age throughout Northern Europe." Quart. Journ. 

 Geol. Soc. Vol. xxvi. p. 326. 



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