INTKODUCTION. XV 



been good enough to undertake the laborious task of checking the 

 entries of each specimen, and has also, as before, given me the 

 advantage of his great personal knowledge of the history of indi- 

 vidual specimens. Thanks are due to Mr. Medlicott, late Director of 

 the Geological Survey of India, to Prof. E. D. Cope, to Prof. H. A. 

 Nicholson and Messrs. Blackwood, to the Councils of the Geological, 

 Zoological, and Palseontographical Societies, as well as to the authors 

 of various memoirs, for permission to use woodcuts from their 

 publications. 



The Beckles Collection, mentioned for the first time in this part, 

 was purchased in 1876 from Mr. S. H. Beckles of Hastings. 



RICHAUD LYDEKKEE. 



The Lodge, Harpenden, 

 Hertfordshire. 

 June 10, 1887. 



POSTSCRIPT. 



Since the above was sent to press the abstract of a memoir by 

 Dr. Osborn, of Princeton, on Mesozoic Mammalia (Proc. Ac. Nat. Sci. 

 Philad. June 21, 1887), has reached me. In this memoir the genus 

 Amphitylus is founded on the undetermined specimen, No. M. 2299, 

 p. 272, of the text, and AiJirodon upon the unnamed maxillae cata- 

 logued on p. 291 ; the latter being made the type of a new family, 

 which is regarded as allied to the PhascolomyidcE. The maxiUa or 

 Bolodon is figured, and the mandible No. 36822 mentioned on p. 274 

 also figured and definitely referred to Awphitherium. An emendation 

 on the classification of Prof. Marsh is proposed. I may observe that 

 I cannot consider it proved that the maxillae on which Athrodon is 

 founded do not belong to one of the genera of which only the man- 

 dible is described, although I am not prepared to say which ; and I 

 may add that the resemblance of the molars of Sjpalacotherium and 

 other forms to those of CJuysocliloris is analogous to that existing 

 between the corresponding teeth of Perameles and Tupaia, and does 

 not therefore appear to afi'ord grounds for the reference of the former 

 to the Insectivora. The name Diplocynodon, Marsh, is preoccupied 

 by Pomel for a genus of Crocodilidce. 



In addition to the above, the following memoirs would have been 

 noticed in the text had copies of them reached this country in time. 



