PREFACE, 



The following descriptions have appeared at intervals in 

 the ' Annals of Natural History ' during the last six 

 years, and a small impression of the series of papers 

 descriptive of new British Fossils is now published in a 

 connected form for convenience of reference. 



I originally intended to issue a set of Plates with this 

 volume, but although several of the species are yet un- 

 figured, illustrations of many others have appeared, since 

 their original publication, in the volumes of the Palaeon- 

 tographical Society, and elsewhere by others, as well as in 

 the Catalogue of the Cambridge Palaeozoic Fossils by 

 myself, and it was not thought desirable to add to the 

 expense of the volume by incurring the cost of the large 

 number of plates which would be required to illustrate 

 the remaining species, principally from the newer 

 rocks. 



Cambridge, August 1854. 



