36 Proceedings of the Royal Physical Society. 



" The Carboniferous System in Scotland, characterised by its 

 Brachiopoda." It appeared in two successive volumes, and 

 was afterwards separately published as a small book. Mr 

 Davidson here gives descriptions with copious notes and 

 remarks on the then known species of Carboniferous 

 Brachiopoda, which, as researches went on, were in- 

 creased at the time of completion of the " Monograph" 

 to fifty. 



During last year this indefatigable writer contributed a 

 supplement to his work, forming part 8 of vol. iv. of "The 

 British Fossil Brachiopoda," with eight additional plates 

 devoted to Carboniferous species. The number of species 

 through recent discoveries, has been slightly increased, 

 the total now standing at 59 or 60, distributed throughout 

 the sub-divisions of the Carboniferous system in Scotland, 

 thus : 



Calciferous Sandstone Series, 23 to 24 „ 



In the gigantic task thus brought to a successful termina- 

 tion Mr Davidson has had the assistance of a large staff of 

 local collectors and observers. It is perhaps invidious to 

 mention one name more than another, but as regards those 

 resident in Scotland, the following^ o^entlemen should be re- 

 called to mind : 



From Lanarkshire localities, specimens have been exten- 

 sively collected by Messrs J. Armstrong, J. Bennie, Dr J. S. 

 Hunter, and E. Slimon ; from Stirlingshire, by Mr J. Young 

 F.G.S. ; from Ptenfrewshire and Dumbartonshire, by Messrs 

 Armstrong, J. Thomson, and J. N"eilson, jun. ; the county of 

 Ayr has been well searched by many of the preceding col- 

 lectors, and of late more particularly by Messrs E. Craig, of 

 Beith, and J. Smith, of Kilwinning. The collections from 

 the Lothians and Fife were originally made for Mr Davidson 

 by the late Ecv. Dr Fleming and Hugh Miller, supplemented 



