010 SUPPLEMENTARY NOTfiS. 
plicable to such animals, and their movements are probably 
effected by muscular exertion only. 
P. 412, 1. 12. Mr. Murchison in his excellent memoir on a 
fossil Fox found in the Tertiary Fresh-water Formation at 
CEningen, near Constance, gives a list of many genera of fossil In- 
sects as well as of Crustacea, Fishes, Reptiles, Birds, and Mam- 
malia, discovered in the slaty marl and lime-stone of these very 
interesting Quarries. See Geol. Trans. Lond. N. S. V, III. p. 277. 
P. 412, Note. The collection of fossil Insects from Aix de- 
scribed in the paper here referred to, was made by Mr. Lyell in 
conjunction with Mr. Murchison. In the same paper is noticed 
the preservation of the pubescence on the head of one of the 
Diptera. See Ed. New Phil. Journ. Oct. 1829, P. 294, PI. 6, 
Fig. 12. 
P. 446. In the concluding note of my first edition, I men- 
tioned Ehrenberg's discoveries of the silicified remains of fossil 
Infusoria in the Tripoli, or polishing slate, (PoHerschiefer 
Werner), from Bilin in Bohemia, and from four other localities, 
and also his discovery of similar remains in the slimy Iron Ore of 
certain marshes. I am nov^' enabled to extract further infor- 
mation from his memoirs upon this subject, presented to the 
Royal Academy of Berlin, in June and July 1836, and trans- 
lated in Taylor's Scientific Memoirs, February 1837. 
It is stated in this memoir, that the mineral springs of Carlsbad 
contain living species of Infusoria, of the same kind that occur 
in sea water, near Havre in France, and near Wismar on the 
Baltic ; and also that a kind of siliceous paste called Kieselguhr, 
found in nests of the size of a man's fist or head, in a Peat Bog 
at Franzenbad, near Eger, consists almost entirely of minute 
siliceous shields of a species of Navicula, N. viridis, which is 
now living in fresh-water, near Berlin, and widely diffused else- 
where. The remains of Infusoria also almost entirely compose the 
Kieselguhr of the Isle of France, and a similar substance called 
Bergmehl, from San Fiore, in Tuscany. Nine existing species 
have been recognized in the Kieselguhr of Franzenbad ; in that 
of the Isle of France five species ; in the Bregmehl of San Fiore 
nineteen species; in the PoHerschiefer of Bilin four species. 
