Acidaspis. 



71 



TBILOBITA. 



The following important addition to the list of Trilobites is due to the great kindness of M. Barrande. Six- 

 teen species have been omitted because they are already registered from M. Barrande 's several " Defenses des 

 Colonies " recently published. 



A TABLE OF TEILOBITES DISCOVERED IN BOHEMIA SINCE 1852. 



The Table subjoined, showing the vertical Distribution of Trilobites in Bohemia, greatly enriches the 

 ' Thesaurus.' It has been drawn up by M. Barrande, and by him presented for insertion here. Its principal 

 object is position and vertical range ; but he has also inserted the stages of many species with a particularity 

 beyond my power. The ' Thesaurus' usually supplies the localities. 



