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a great number of interesting fossil vertebrates, but also discusses tbe geolo- 
gical structure of the western slope of the Rocky Mountains and the plateau 
to the west of them in north-western New Mexico, in which he identifies 
probably Triassic strata of freshwater origin, and Cretaceous, Eocene, Upper 
Miocene, and Postpliocene deposits. The mesozoic fossils are very few, con- 
sisting only of a cretaceous fish apparently allied to Mugil, and a few triassic 
(?) Orocodilia, Dinosaur ia, and Sauropterygia. Besides these, Prof. Cope 
describes some fossil dinosaurian bones under the name of Dystrophceus vice- 
malce , obtained from the supposed triassic rocks of south-eastern Utah. 
The Eocene fossils, which are from the Wahsatch formation, are much more 
numerous, the total number of species here described being 87, of which 54 
are mammals, 24 reptiles, 8 fishes, and 1 a bird. The reptiles include species 
of crocodiles, lacertilia, and testudinata, the last order making up two-thirds 
of the whole. Among the mammalia, the carnivora, quadrumana, probos- 
cidea, and ruminantia are wanting, and no remains of edentata or chiroptera 
have been found. From the consideration of the fossils, Prof. Cope is 
inclined to correlate the Wahsatch formation with the Suessonian of 
Europe (Lower Eocene). In connection with this Prof. Cope has some 
remarks on the origin of the various groups of mammalia by descent, accom- 
panied by a new version of a table published by him six years ago. The 
Loup Fork formation, which Prof. Cope correlates with the European Upper 
Miocene, has furnished him with 34 species of vertebrata in the marls of 
Santa Fe in New Mexico, two of them being tortoises, three birds, and 
twenty-nine mammals. From Prof. Cope’s point of view these mammalia 
exhibit a decided advance on those of the Wahsatch group, as they include 
a proboscidean {Mastodon productus, allied to angustidens), five carnivora 
(four of them dogs or wolves), and eleven Artiodactyla, giving a decided 
preponderance to the gyrencephalous forms. All these fossils are beautifully 
figured in the numerous plates, which, as we have already stated, accom- 
pany the volume, and place visibly before us the forms and characters of 
the magnificent series of remains of vertebrate animals which it has been 
the author’s good fortune to work out and describe. 
Of State Geological Survey Publications, we have received a volume of 
the u Geology of Wisconsin,”* which, although professing on its title page 
to be the second volume, is in reality the first issued. The first volume, we 
are told by the chief geologist, Mr. T. C. Chamberlin, will contain “ general 
conclusions that can only be arrived at after the completion of field work, 
and its appearance must be delayed until that work is accomplished.” The 
State of Wisconsin occupies a large extent of ground between the western 
shore of Lake Michigan and the Mississippi river, and the work before us 
includes the details of the topographical and geological structure of all but 
its north-western portion. It is divided into three sections : the first, re- 
lating to the eastern parts, is by the Chief Geologist himself ; the second, 
describing the central regions, is by Mr. R. D. Irving; whilst Mr. Moses 
Strong gives an account of the lead region, a comparatively small district in 
* (i Geology of Wisconsin, Survey of 1873-1877.” Vol. II. Accompanied 
by an Atlas of maps. Published under the direction of the Chief Geologist, 
by the Commissioners of Public Printing. 8vo., 1877. 
