106 
room xi. Infusoria have been proved to be much more 
complicated than they were generally supposed, 
by the microscopic observations of Dr. Ehren- 
berg. 
The Cases No. 13 — 16 contain the Zoophytes 
( Zoophytaria ), so called from the general re¬ 
semblance which their corals bear to plants. 
These animals are known from all the other ra¬ 
diated animals by their bodies being soft, and 
their mouths furnished with a determinate num¬ 
ber (usually eight) of pinnated or feathered 
tentacula, and their stomachs furnished with 
eight intestines, of which two are prolonged 
into the common mass, the others ending in 
the ovaria. They live united together in cells 
of a shelly tubular structure, or sunk into a 
fleshy or chalky bark. This class is divided 
into three groups, characterized by the structure 
of the coral which they form. 
In the first family, Cornicularidce , the cells of 
the animal are tubular and horny, or fleshy. In 
the genus Cornicularia they are long and funnel- 
shaped, springing from a creeping base. In 
Telesto and Clavularia they are branchy and 
fleshy, with eight longitudinal grooves. 
In the family Tubiporidce the cells are cylin¬ 
drical, tubular, placed vertically side by side, at 
some distance from each other, and united to¬ 
gether into a mass by means of horizontal la¬ 
mina, placed at certain distances from each 
other, 
