INTRODUCTION. 



THIS Catalogue includes in addition to the types proper, 

 those specimens which have been figured and described as 

 examples of species previously defined. 



The names at present accepted are printed in Clarendon type, 

 the synonyms in italics. After a considerable portion of the 

 work had been printed, it was suggested to me that it would 

 have been better to have given only the names under which 

 the specimens were described, or at any rate to have given 

 greater prominence to these rather than to the names now 

 accepted. In some ways this method would certainly have 

 been more convenient than the one adopted. 



In order to make the work more complete, I have gone 

 through a large amount of palseontological literature, and have 

 in this way found in the Museum many types whose existence 

 here was previously unsuspected. Nevertheless, there can, I 

 think, be no doubt that others will in time be discovered. 



The following is a list of the authors who have described 

 specimens in the Museum : A. L. Adams, L. Agassiz, D. T. 

 Ansted, L. Barrett, F. A. Bather, W. Bean, T. Bell, G. T. 

 Bettany, J. F. Blake, C. J. F. Bunbury, P. H. Carpenter, 

 W. Carruthers, J. Carter, C. Coignou, T. Davidson, J. W. Davis, 

 J. Donald, P. M. Duncan, H. M. Edwards, R. Etheridge, 

 R. Etheridge, jun., H. Falconer, T. W. Fletcher, A. H. Foord, 



