IV PEEFACE. 



Loxomma from the Coal-Measures of England and Scotland, in 

 this Museum are unsurpassed by any other. The remarkable 

 genera Placodus and Cyamodus are represented by several valu- 

 able original specimens and by reproductions of von Meyer's 

 types. Lastly, fine examples are to be seen in the cases of 

 Cryptobranchus scJieuchzeri and C. tschudii from the Miocene of 

 Oeningen and Bonn. 



HENRY WOODWARD. 



Geological Department, 



British Museum (N. H.), ; 



25th April, 1890. 



