Geology and Paleontology. 163 
universally present in the Eocenes, the Perissodactyla and the 
Rodentia, are wanting from the Puerco. 
In conclusion it may be safely assumed that in the Puerco 
fauna, we find the ancestors of the species of Eocene and of later 
times. In the Tzeniodonta we get ancestors of Tillodonta and 
probably of Rodentia and Edentata. In Creodonta we get the 
ancestors of the Carnivora, in the family of the Miacide. In 
the Condylarthra, we get the ancestors of the Diplarthra and 
Amblypoda, and in the Puerco Amblypoda the ancestors of those 
of the following epochs. Hence the investigation of this fauna 
possesses an especial interest for the mammalogist and for the 
evolutionist, as well as for the geologist proper.—E. D. Cope. 
SCHLOSSER ON THE CÆNOZOIC MARSUPIALS AND Uneuicu- 
LATA.'—The first part of this work contains all of the Unguicu- 
lata, except the Edentata, Rodentia and Carnivora. The last- 
named order will form the second part. The work is an important 
one, in quarto form, and the first part is illustrated with five plates. 
This supplements the American works on the same subject and 
brings it up to the present time, with minor exceptions. 
The present author shows throughout, his fine appreciation of the 
points of structure of the vertebrate skeleton, and he makes judi- 
cious use of them, from a systematic point of view, although one 
observes, perhaps, a tendency to rather more minute taxonomic 
division than the circumstances warrant. The work is also char- 
acterized by a thorough acquaintance with the literature of the 
subject. Important additions to our knowledge are made in every 
department. 
e can only mention here the descriptions of the little-known 
genera of Von Meyer—Dimylus, Cordylodon and Oxygomphius, the 
first two remarkable forms of Insectivora. To the Creodonta he 
adds the new genus Pseudopterodon, which is founded on a species 
of about the size of a fox (P. ganodus), allied to Pterodon. 
Dr. Schlosser continues to exclude the Miacide from the Creo- 
donta; but he has not been aware that Scott shows that the lum- 
bar zygapophyses have the characters of the other members of that 
order or sub-order. For some unaccountable reason he places Estho- 
nyx in the Edentata. Numerous important additions are made to- 
the Chiroptera, in the genera Vespertiliavus and Pseudorhinolophus, 
ne of the most striking discoveries recorded is the fact that the 
sup canine teeth of the Lemurs of the present period are 
really the anterior premolars, as in the Artiodactyle genus Oreo- 
* Die Affen, Lemuren, Chiropteren, Insectivoren, Marsupialier, Creo- 
donten u. Carnivoren d. europäischen Tertiärs, von Max Schl 
I Theil. Alfred Hélder. Wien, 1887. 
