X INTRODUCTION. 



Cetiosaurus in the present volume ; and the latter in the case of the 

 names PlatycJioerops and Miolophus in the 5th part of the ' Catalogue 

 of Fossil Mammalia.' In this, as in other analogous instances, it is, 

 however, almost impossible to draw any absolutely hard-and-fast rule 

 which shall hold good in all cases. 



Among the Dinosauria, the writer has been guided in the asso- 

 ciation of certain remains by the memoirs of Prof. 0. C. Marsh ; and 

 it is of course obvious that in such cases the association must stand 

 or fall by the correctness or otherwise of those memoirs. So far, 

 however, as English specimens are naturally associated, they appear 

 in all cases to support the restorations and associations given by the 

 American palaeontologist 1 . 



The following list furnishes a few particulars relating to the 

 history of some of the more important series of specimens col- 

 lected by private individuals, and subsequently acquired by the 

 Museum : — 



Beckles Collection. — Purchased in 1876 from Mr. S. H. Beckles, 

 E.B.S., of Hastings ; and comprises specimens from the Wealden and 

 Purbeck. 



Bowerbank Collection. — This collection comprises an extensive 

 series of specimens from the English Cretaceous, and was purchased 

 in 1865 from the late Dr. J. S. Bowerbank, E.R.S., of Highbury. 



Bravard Collection. — The reptilian remains belonging to this 

 collection were obtained from the Erench Tertiaries, and were 

 purchased in 1852 from the late M. Bravard. 



Cauiley Collection. — Comprises specimens from the Indian 

 Siwaliks, presented by Col. Sir Proby T. Cautley, K.C.B., in 1840. 

 [In the Mammal Catalogue it is stated, on the authority of Mr. W. 

 Davies, that the presentation was made in 1842 ; a recent perusal 

 by that gentleman of original documents preserved in the Museum 

 has, however, shown that the earlier date is the correct one.] 



Claussen Collection. — A series of specimens from the Pleistocene 

 of South America, purchased in 1845 from the late Herr Claussen. 



Croizet Collection. — Purchased in 1848 from the late Abbe 

 Croizet ; and includes specimens from the French Tertiaries, more 

 especially from the district of the Auvergne. 



Cunnington Collection. — This collection was purchased in 1875 

 from the late Mr. W. Cunnington, of Devizes. 



Dawson Collection. — An important series of mainly Dinosaurian 



1 The absence of the inner trochanter in the femur referred to Stegosaums 

 (p. 177) by Prof. Marsh, and its presence in that of Omosaurus, suggests that 

 the former reference may be incorrect. 



