1893. SOME NEW BOOKS. 223 
which are supposed to justify the removal of the extinct Zeuglodonts 
from the Whales. 
Beyond the circumstance that a large number of the newly- 
discovered South American forms are described and figured, the only 
point in the part devoted to the Ungulates to which we need direct 
attention is in regard to the classification of the Perissodactyles. 
Following recent American views, the author adopts a_ phylogenetic 
classification, and includes in the same family such widely-different 
forms as the modern Equus and the Eocene Hyvacotherium. On the 
other hand, Systemodon, which is very close to the latter, is placed in 
the Tapiride. That these two Eocene forms may be the ancestral 
types of the two families to which they are respectively referred, we 
are not going to dispute fora moment. We do say, however, that to 
include them in such families, and to separate them from one another, 
is, to our mind, only confusing classification. Moreover, if we are to 
have a phylogenetic classification, the author does not go far enough. 



































































Fie. 3.—Palatal aspect of the skull of Hipparion. 
‘Surely, seeing that the Condylarthra are admittedly the ancestors of 
the Perissodactyla and Artiodactyla, there is just the same justifi- 
cation for putting all three in a single group, as there is for refusing 
to admit that there may bean Eocene family (Lophiodontide) which 
shall include the ancestors of both the modern Equide and: the 
Tapiride. As an example of the illustrations among the Equidz, we 
reproduce one of the skulls of Hipparion. 
That the work (however much we may be disposed to differ from 
it as regards points of detail) when complete will be of inestimable 
value to the paleontologist and zoologist, we have already had 
occasion to say elsewhere, and our only regret is that the limited 
cult of the former science in this country forbids the publication of 
one on the same lines in England. see BE 
ELEMENTS D’ANATOMIE COMPAREE. By Remy Perrier. Pp. 1,000. With Illustra- 
tions. Paris: ]. B. Bailliére et Fils, 1893. Price 20 francs. 
ZOOLOGICAL text-books seem at the present time to be multiplying at 
a rate altogether out of proportion to the numbers of the students for 
whom they are intended. ‘This is not only the case in this country, 
but also on the Continent. The commencing student of zoology has 
so many works to choose from (we cannot, however, justly say that 
there is an embarras de richesses) that he probably ends by taking one at 
random. It would be much better if the elementary student would 
refrain altogether from purchasing text-books, and trust himself to the 
