56 The American Geologist. January, lyui. 
discus figured on this plate. This greatly resembles the species of this 
genus which occur with Olenellus ; the Agnostus, however, is flatter 
than the typical species of the Paradoxides beds and may be an earlier 
form. 
In this paper are described, of Ptyhoparia i new species, Microdis- 
cus 2 new species, Agnostus i new species, Kutorgina (cingulata Bill.) 
and Obolella (cf. chromatica Bill.) The species are compared with 
those of Europe and America. 
Any claim that Agnostrus occurs in strata below Paradoxides re- 
quires to be well supported. The type of the one that Ford thought 
he found at Troy, N. Y., is lost and the figure he gives scarcely sup- 
ports the reference to this genus. Baron Toll thinks that A. atavus of 
Tullberg may be claimed for the Olenellus zone ; but while Tullberg 
refers the group of strata in which it was found at Andrarum to the 
Olenellus zone, Olenellus (i. e. Holmia) is found only in the lower 
part of this set of beds, and Tullberg reports a Paradoxides in these 
beds below the layer which carries Agnostus ataviis. 
Descriptions and figures of F. Schmidt's species are given and a 
very full account of occurrences of the several forms of the Archaeo- 
cyatliinse. 
Table C (p. 55) is an endeavor to show diagrammatically the chrono- 
logical relation of the several parts of the Siberian Cambrian, and the 
author's view of the bearings of the several groupings of species, and 
the nature of the sediments, on the probable depth of the Cambrian 
sea at the time these creatures of the Cambrian age were entombed. 
In conclusion we may congratulate the author on having rescued 
from the unknown a new chapter of geological history, and on having 
placed us at a new point of view, from which we may regard the ac- 
tivities of the Cambrian reef-builders. G. f. m. 
La Face de la Terrc (Das Antlitz der Erde), par Ed. 5"uess, traduit 
avec I'autorisation de I'auteur et annote sous la direction de Em- 
manuel de Margerie. Tome II, Paris, igoo. 
This well-known classic on the physical features of the surface of 
the earth is considerably^ enlarged by original notes and references to 
later literature. This tome begins with the "third part," the seas. After 
a full description of the Atlantic and Pacific ocean, and a comparison 
of one with the other, the author enters upon the discussion of paleo- 
zoic seas, thus coming within the domain of geology proper. Here is 
abstracted and epitomized the result of all the study of the paleozoic 
both in America and Europe. The Mesozoic seas are treated in the 
same manner, then the Tertiary seas. In chapter VIII the author dis- 
cusses the shore lines of Norway, their possible elevation, the glaciers 
and fjiords. A history of the temple of Serapis at Pouzzoles, as af- 
fected by earth movements, and by volcanic ejection, as Avell as the 
results of exhumation and its present state are included in chapter IX. 
The Baltic and the North seas during the historical period, and the 
Mediterranean during the same period, are subjects of long inquirj^ 
