82 Reviews—Type Ammonites. 
The book is admirably produced, and the use of heavy type for 
the headings of sections and the addition of sub-headings in the 
margin make it very easy to refer to. Illustrations are not numerous, 
but in addition to text-figures there are a dozen plates reproduced 
from photographs and a number of black and white maps of different 
‘ regions. ‘There is no general geological map, which would have 
necessitated the use of colour and would have greatly increased the 
cost of production; but since the map issued by the Geological Survey 
is available, it was certainly wise not to increase the expense of the 
book unnecessarily, and considering the circumstances the price 
has been kept remarkably low. 
Poe 
Type Ammonites. By 8.8. Buckman. Part XIX, August, 1919; 
XX, October, 1919; XXI, March, 1920; XXII, June, 1920. 
pp. 5-18, with 53 plates and a portrait. Published by the 
Author. Sold by W. Wesley & Son. 
pant XIX begins vol. iii of this work, of which the title of the 
previous volumes is Yorkshire Type Ammonites. No indications 
are given as to whether the author contemplates limiting the scope 
of the work to the Jurassic Ammonites of the British Isles or giving 
it a more extensive stratigraphical and geographical range. 
Additional terminology is proposed, and the following generic 
names introduced: Lamberticeras, Vertebriceras, Korythoceras, 
Pavloviceras. The first of these names was found to be pre- 
occupied, and is replaced by Bourkelamberticeras. Prionodoceras is 
introduced in place of Prionoceras. Ina section on “‘ Development ” 
the author says, “‘ The early Orthocones utilising the gas effusion, 
which resulted from temporary indigestion under the nervous 
apprehension of danger, found that a cone thus made more buoyant 
was a help in rapid retreat from foes.”’ 
THe Minerat INDUSTRY OF THE British EMPIRE AND FOREIGN 
Countries. Imperial Mineral Resources Bureau Digests. 
Chrome Ore and Chromium, 29 pp., 1s. net; Magnesite, 42 pp., 
ls. 3d. net; Monazite, 15 pp. 6d. net; Felspar, 16 pp., 6d. 
net; Borates, 24 pp., 9d. net; Fuller’s Earth, 15 pp., 6d. net ; 
Nitrates, 28 pp., 9d. net; Arsenic, 19 pp., 6d. net; Bismuth, 
14 pp., 6d. net; Asbestos, 34 pp., ls. net. Stationery Office, 
1920. 
fete ten pamphlets listed above are the advance guard of what 
is intended to be eventually an annual volume somewhat on 
the lines of that well-known American publication The Mineral 
Industry, containing information on the mineral resources of the 
world, with special reference to the British Empire and its needs. 
The present publications are to a great extent a review of the progress 
or otherwise of each industry during the War period, 1914-1919. 
