﻿8 Proceedings of the Boyal Physical Society. 



Greville, and others, the land-marks during the next half- 

 century are: Wilson and Duncan's Coleoptera. (1834), 

 Macgillivray's lists of Birds (1837 and 1839), Lowe and 

 Logan's Lepidoptera (1852), Murray's records of Coleoptera 

 (1853), Turnbull's 'Birds of East Lothian' (about 1855 and 

 1867), and the "Insecta Scotica" (1872-1885)— Lepidoptera, 

 by Buchanan White, by whom the scheme was originated ; ^ 

 Coleoptera, by D. Sharp; and Trichoptera, by King and 

 Morton. These were followed by Eoebuck's " Census " of 

 the Land and Fresh-water MoUusca (1890), my own account 

 of the Mammals (1891), and of the Eeptiles and Batrachians 

 (1894), and Carpenter and Evans's Spiders (1894). The past 

 dozen years has been a period of increasing activity, during 

 which much new ground has been broken by myself and 

 others, details of which will be found under Protozoa, 

 Eotifera, Arachnida, Myriapoda, Insecta, and other groups. 



The Firth of Forth, as I regard it, is bounded to the east 

 by a line drawn from Fife Ness to St Abb's Head. The 

 Firth and the drainage area thus enclosed constitute the 

 " Forth " Area {cf. sketch map in previous vol.). To show 

 distribution properly, the area should be sub-divided into 

 lower, middle, and upper Forth. 



1 now pass on to the consideration of the various groups 

 in detail, concluding with a summary which shows at a 

 glance how the investigation now stands. The groups are 

 taken in the order in which they are arranged in the 

 Cambridge Natural History.- 



PEOTOZOA. 



To begin at the beginning, then, let us see what has been 

 done among the Protozoa, that great assemblage, or " Phylum," 

 of unicellular creatures which the microscope has revealed 

 to us. 



The ordinary generic types, such as Amceba, Difflugio., 

 Arcella, jEicgle7ia, Ceratium, Paraiimcium, Stylonychia, Vor- 

 ticella, Epistylis, and so on, are well enough known to every 

 microscopist, but very few, I imagine, have ever attempted 

 to master the various forms under each which do duty as 



^ It is apt to be forgotten that Dr White was the first to mark off Scotland 

 into the now well-known drainage areas. 



2 For vol. iv., not yet published, I have only the announcement to go by. 



