Review of Recent Geological Literature. 395 
It is iu the preparation and publication of just such practical ami 
non-technical treatises as this that the scientist and geologist contribute 
most directly to the dissemination of information among those not 
technically educated and thereby promote the material welfare of the 
community. In subject matter, in arrangement and in appearance this 
bulletin sets a high standard for others, and although it may not be 
excelled, it should serve as an incentive to economic geologists of other 
states to do as much for their own regions. H. v. w. 
Annual Report of the Minister of Mines {of British Columbia) for 
the year ending 31st December, 1895. By James Baker. (Roy. 8vo, 82 
pp., 1 table and 7 sketch maps. Victoria, 1896.) This report, which is 
the 22d annual, gives a very complete summary of mining operations 
in British Columbia for 1895. The gold and silver production during 
the year is said to have been $636,544, of which the silver amounted to 
$255,200. A small amount of platinum is reported, with a value of 
$3,800. The production of coal from the three active collieries of the 
Province was 939,654 tons, of which the domestic consumption amounted 
to 188,319 tons, and the remainder was shipped to United States ports, 
principally C'alifornian. 
Considerable information is given concerning the recent development 
of placer mining and river dredging for gold. Atone locality the im- 
provements already made include the construction of 14 miles of ditches, 
and the laying of 15,097 feet of steel hydraulic piping, ranging in size 
from 18 inches to 24 inches in diameter, and having a thickness of 9 32 
of an inch, calculated to hold water under a head of 998 feet. 
Among the difficulties encountered in dredging for gold in the Fraser 
river is the sudden rise of water in the spring when the river frequently 
rises 50 feet or more without previous warning. Much of the gravel is 
said to be worked by shafts and underground tunnels, or in situations 
where it is necessary to elevate the tailings 100 feet or more by hydrau- 
lic elevators in order to dispose of them. Even under these disadvant- 
ages it is said to be possible to realize a profit if the operations are 
conducted on a large scale. h. v. w. 
Neu- Ordovician Genera and Species of Trilobites. By J. Bergeron. 
(Bull. Geol. Soc. of France, 3d ser., vol. 23. p. 465, 1895.) In this paper 
Dr. Bergeron describes a number of forms whose exact position in tin' 
Ordovician system is not determined. He gives a fuller description of 
the new subgenus Calymenopsis established by him in association with 
M. Munier-Chalmas. In the description of the two species, Dicellocep- 
Imhis {■?) villebruni (new) and Asaphelina barroisi 'p. 32), he remarks on 
the resemblence of these forms to the true Dicellocephali found in the 
uppermost Cambrian beds of America, Great Britain and Sweden. New 
species of Ogygia ami Mglina are described, but the most notable type 
described is his new genus Dictyocephalites, which, with some features 
that recall Cheirurus, is referred to the neighborhood of Eurycare. 
The head-shield is very broad, and the genal spines go out from the 
middle of the cheek-margin as in Eurycare. The thorax is of numerous 
