Xll INTRODUCTION. 



W. Shrubsole, of Sheppey, and mainly consisting of specimens 

 from the London Clay. 



Sommerring Collection. — Purchased in 1827 from the late Prof. S. 

 T. Sommerring of Munich. 



Tesson Collection. A valuable series of specimens from the Lias 

 and Jurassics of Normandy ; acquired by purchase in 1S57 from the 

 late Monsieur Tesson, of Caen. 



Toulmin-Smith Collection. — Purchased in 1869 from the widow 

 of the late Mr. J. Toulmin-Smith, of Highgate. 



Van Breda Collection. — A large collection, chiefly from the Cre- 

 taceous of Maastricht and the Solenhofen limestones, purchased 

 in 1871 from the executors of the late Professor Van Breda, of 

 Haarlem. 



Wetherell Collection. — Purchased, through the late Mr. J". Tennant, 

 from Mr. N. T. Wetherell, of Highgate, in 1871. 



In all cases the references to generic and specific names have 

 been verified after they were in type, so that they may be consi- 

 dered thoroughly reliable. Mr. William Davies, E.G.S., has been 

 good enough to come to the Museum for the express purpose 

 of checking each individual entry with the specimen to which it 

 refers ; and it is solely due to his intimate acquaintance with the 

 Collection that it has been possible to give the correct history of 

 many of the specimens which have been long in the Museum. 



The author is indebted to Prof. 0. C. Marsh, of Yale College, for 

 the loan of many excellent woodcuts of North-American Dinosaurian 

 remains with which this volume is illustrated. Thanks are also due 

 to the Council of the Geological Society, and to Mr. J. W. Hulke, 

 E.R.S., Prof. H. G. Seeley, E.R.S., and Sir Richard Owen, K.C.B., 

 E.R.S., for the use of woodcuts from the Geological Society's 

 4 Journal.' Prof. H. Alleyne Nicholson and Messrs. Blackwood 

 have also been good enough to allow the reproduction of woodcuts 

 from the c Manual of Palaeontology.' And the author is also in- 

 debted for similar favours to the Director of the Geological Survey 

 of India, and to M. L. Dollo, of the Royal Museum of Natural 

 History, Brussels. 



Finally, it may be mentioned that since the notice of Scapho- 

 gnathus crassirostris (p. 28) was in type, a second species of that . 

 genus has been described from the Upper Lias of Whitby by Mr. E. 

 T. Newton, in the ' Proc. Roy. Soc' vol. xliii. p. 436 (1888). 



RICHARD LYDEKKER. 



* Harpenden, 

 June 1st, 1888. 



