DIVISION IV*— RADIATA, or ZOOPHYTES. 
This division includes the most simple forms of animated nature, 
and although these forms vary considerably in the several classes, 
all show traces, more or less distinct, of radiation from a common 
centre. 
It includes five classes. 
Division. Class. 
f I. Echinodermata 
\ II. Entozoa, or, Intestinal Worms 
R ADI AT A. . ^ III. Acalepm 
# IV. Polypi 
* V. Infusoria 
CLASS I.— ECHINODERMATA. 
This name is strictly applicable to the genus Echinus, sea-urchins, 
or hedgehogs, but is applied more generally to the most complicated 
of the radiated animals. All the genera have a well organized skin, 
with distinct viscera, and a sort of imperfect vascular system. 
The class includes two orders. 
Echinodermata.. { \ ^cellate 
ORDER I.— Pedicellata. 
The envelope in this order is pierced with apertures, through 
which issue numerous membranaceous tentacula, which acting as 
organs of motion, are called the feet. 
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