538 Reviews. [ July, 
have been regarded “not as related to other forms of life and to 
climatal conditions—not as successive tenants of the earth, but as 
fabrics, each of which is built upon a certain plan.” 
Availing himself of the Cuvierian classification, instead of aspiring 
to be the founder of a new method, he has built up the following im- 
proved zoological system :— 
TABLE OF THE CLASSES OF THE ANIMAL KINGDoM. 
The Linvits of the Four Cuvierian Sub-Kingdoms are indicated by the Brackets 
and Dotted Line. 
Rapiata. 
: Gregarinidu. Infusoria. Scolecida (?). 
: Rhizopodu (?). Echinodermata. : 
: Spongidu. Oa : 
: : Annelida. 
Ir : Crustacea. 
s Alene i sCrastace ARTICULATA. 
: Actinozou. ‘ Arachnida. 
: Myriapoda. 
: Polyzoa. : Insecta, 
Brachiopoda, 
Ascidioida. 
Pisces. 
Lamellibranchiata, Amphibia. 
) MoLiusca. Reptilia. VERTEBRATA, 
Branchiogasteropoda. Aves. 
Pulmogasteropoda, Mammalia. 
Pteropoda, 
Cephalopoda. 
As each of the foregoing groups, the author says, “embraces one of 
the principal types or plans of modification of the animal form,” a 
precise knowledge of that which constitutes the typical structure of 
each of these groups” will serve to convey an exhaustive knowledge of 
the animal kingdom. He proposes, therefore, to “ define the various 
groups,’ or where definition is not yet possible, “to describe a 
typical example.” And it is due to Professor Huxley to say, that in 
thus seeking to present to his readers a correct outline of the animal 
kingdom, he has fulfilled all the conditions essential for the execution 
of his task; and where he falls short in its performance (as he 
acknowledges from time to time, in the course of his survey), it is not 
from any inability to classify and arrange, but owing to the want of 
materials with which to operate. 
His illustrations (we mean his drawings), which necessarily form 
a most important feature in the work, have the merit of being to a 
great extent original, and those which are not so, are in most cases 
taken from the newest works bearing upon the special subject to which 
they refer, the observer’s name being in every instance appended to 
them,—a rule which we recommend for more general adoption. The 
careful dissections of the author, more especially of the typical 
