180 Miscellaneous. 



December 18, 1895, — Dr. Henry Woodward, F.E.S., 

 President, in the Chair. 



The following communication was read : — 



* The Eritish Silurian Species of Acidasj)is.' By Philip Lake, 

 Esq., M.A., P.G.S. 



In this paper descriptions are given of those species of Acidaspis 

 in the Silurian of Britain which have hitherto been incompletely 

 described. The British forms are compared with those from the 

 same system in Sweden and Bohemia. Five, out of nine, are 

 represented by the same or very closely allied species in Sweden ; 

 two in Bohemia. All the Swedish forms except one are represented 

 in Britain, and one in Bohemia as well as in Britain. 



MISCELLANEOUS. 

 Numbers of Zoological Species known in the Years 1830 cmd 1881. 



By Dr. A. Gunther. 

 Some years ago I made a computation of the approximate numbers 

 of species of animals known in the years 1830 and 1881 respectively, 

 with the following result : — 



1830. 1881. 



Mammals 1,200 2,300 



Birds 3,600 11,000 



Reptiles 443 2,600 



Amphibians 100 800 



Pishes 3,500 11,000 



Crustacea (year 1840) (1,290) 7,500 



Pycnogonida 8 70 



Arachnida 1,400 8,000 



Myriopoda 450 1,300 



Insecta : — 



Coleoptera 17,000 93,000 



Orthoptera 800 6,500 



Neuroptera 400 4,000 



Hymenoptera 2,400 30,750 



Lepidoptera 14,500 44,500 



Diptera 11,000 24,400 



Rhynchota 3,000 17,000 



Annulata (Lamarck in 1838) (130) 3,100 



Turbellaria and Nemertida (ditto) . (20) 170 



Entozoa (ditto) (222) 2,800 



Rotatoria (ditto) (40) 120 



Mollu&ca 11,000 33,000 



Echinoderms (ditto) (230) 1,843 



Coeleuterata (year 1834) 500 2,200 



Radiolaria (Ehrenberg, 1844) (5) 2,000 (Haeckel) 



Poraminifera (say) 100 900 



Infusoria (year 1838) (200) (say) 400 



Spongiida (Blainville, 1835) (50) (say) 400 



73,588 311,653 



