gO HISTORICAL PALAZON TOLOGY. 
(8) ‘Acadian Geology.” Dawson. Pp. 641-657. 
(9) ‘* Guide to the Geology of New York,” Lincklaen; and ‘‘ Contribu- 
tions to the Palzontology of New York,” James Hall.—‘ Four- 
teenth Report on the State Cabinet.’ 1861. 
(10) ‘ Palzeozoic Fossils of Canada.’ Billings. 1865. 
(11) ‘ Manual of Geology,’ Dana. Pp. 166-182. 2d ed. 1875. 
(12) ‘‘Geology of North Wales,” Ramsay; with Appendix on the 
Fossils, Salter.—‘ Memoirs of the Geological Survey of Great 
Britain,’ vol. iii. 1866, 
(13) ‘‘Onthe Ancient Rocks of the St David’s Promontory, South Wales, 
and their Fossil Contents.” Harkness and Hicks.—‘ Quart. 
Journ. Geol. Soc.,’ xxvii. 384-402. 1871. 
(14) *fOn the Tremadoc Rocks in the Neighbourhood of St David’s, 
South Wales, and their Fossil Contents.” Hicks.—‘ Quart. 
Journ: Geol: Soc:,' xxix. 30-52. 21873. 
In the above list, allusion has necessarily been omitted to numerous 
works and memoirs on the Cambrian deposits of Sweden and Norway, 
Central Europe, Russia, Spain, and various parts of North America, as 
well as to a number of important papers on the British Cambrian strata by 
various well-known observers. Amongst these latter may be mentioned 
memoirs by Prof. Phillips, and Messrs Salter, Hicks, Belt, Plant, Hom- 
fray, Ash, Holl, &c. 
CHAE ER ik 
THE LOWER SILORIAW PERTOU: 
The great system of deposits to which Sir Roderick Murchi- 
son applied the name of ‘Silurian Rocks” reposes directly 
upon the highest Cambrian beds, apparently without any 
marked unconformity, though with a considerable change in 
the nature of the fossils. The name ‘‘ Silurian” was originally 
proposed by the eminent geologist just alluded to for a great 
series of strata lying below the Old Red Sandstone, and occu- 
pying districts in Wales and its borders which were at one 
time inhabited by the ‘‘Silures,” a tribe of ancient Britons. 
Deposits of a corresponding age are now known to be largely 
developed in other parts of England, in Scotland, and in Ire- 
land, in North America, in Australia, in India, in Bohemia, 
Saxony, Bavaria, Russia, Sweden and Norway, Spain, and in 
various other regions of less note. In some regions, as in the 
neighbourhood of St Petersburg, the Silurian strata are found 
not only to have preserved their original horizontality, but also 
to have retained almost unaltered their primitive soft and inco- 
herent nature. In other regions, as in Scandinavia and many 
