364 



Notes and Correspondence. 



April, 



planation of the existence of the 

 genus Trigonia in the Australian 

 seas of the present day ; and se- 

 condly, as showing that the great 

 gap which before existed in its life- 

 history was no proof of the falsity 

 of the postulate of palaeontology to 

 which I have referred, but was sim- 

 ply a consequence of the imperfec- 

 tion of our knowledge of the geolo- 

 gical record ; for, though the record 



itself is imperfect enough, our 

 knowledge of it is still more so. 

 The discovery of this Trigonia also 

 gives strength to the comparison of 

 the recent Australian fauna with 

 that of the Jurassic period in Eu- 

 rope, and supplies those who do 

 not believe in the exact synchronism 

 of distant formations containing 

 similar fossils, with an excellent 

 illustration of their views. 



