BY R. M. JOHNSTON, F.L.S. 157 



embracing also a fairly complete list of the various species 

 of fossils described up to the present time. The tables, 

 by their arrangement, readily indicate the distribution in 

 the various Colonies where the Tertiary formations are 

 principally developed. 



In addition to the generic and specific lists of fossils, 

 a summary has been prepared under the head of Classes, 

 showing in alphabetical order the names of authors to 

 whom we are indebted for the greater part of the original 

 specific descriptions and determinations. It will be seen 

 from this summary that the principal palaeontological work 

 has been accomplished by the following persons ; viz. — 



PlantcB — Baron von Ettingshausen, Baron F. von 



Mueller, and R. M. Johnston. 

 Rhizopoda — D'Orbigny, and Professors Rupert 



Jones and Brady. 

 Actinozoa — Dr. Duncan and Rev. J. E. Tenison- 



Woods. 

 Echinodermata— Dr. Duncan, Lamarck, and Pro- 

 fessor M'Coy. 

 Polyzoa — Professor Busk and Rev. J. E.Tenison- 



Woods. 

 Mollusca — Professor Tate, Rev. J. E. Tenison- 



Woods, R. M. Johnston, and Professor M'Coy. 

 Pisces and Mammalia — Professors Agassiz and 



M'Coy. 



Of the 908 species enumerated. Professor Tate has 

 described 224 species, or nearly 25 per cent. ; Rev. J . E. 

 Tenison-Woods described 1 65 species ; and the author 

 describes or figures 116 species. The three together 

 describe 505 species, or over 52 per cent, of the whole. 



