INFUSORTA. 9 
shell, have one or several whips, or lashes, and a row of 
cilia, with which they lash themselves along with great 
velocity. 
Order II. Suctoria.—This order is represented by 
the Acinete (Fig. 7), beautiful, trumpet-like animals re- 
sembling the purest glass. 
From the body project 
numerous slender tufts 
that are not cilia, but hol- 
low tentacles (arms), hav- 
ing in some a sucker at 
their ends. Their prey 
is grasped by the arms, : 
that contract, each at the Fic. 7.—Acinete. F, attached by stalk ; 
same time sinking into G, encysted.- 
the body of the victim, 
pumping or sucking out its juices. They multiply by self- 
division, while some species have free-swimming young. 
Order III. Ciliata.—These are the true Infusorians, 
easily observed with a common microscope, a drop of 
standing water furnishing myriads. They are either 
free and covered with cilia, or stalked, with the cilia 
about the head. They have a mouth, a digestive cavity, 
or stomach, and multiply by self-division or budding. 
Among the free swimmers, the Parameciums (Fig. 8) are 
the giants, and easily observed if a little carmine is intro- 
duced into the drop. As they dart about, we see that 
they are oblong, narrowing at the head, the back rising 
into quite an elevation, beneath which, upon the under 
side, is the mouth. From the head and on all sides are 
minute prolongations of the body, or cilia, arranged in 
rows, organs of locomotion. The Vorticelle (Fig. 9), or 
bell animalcules, are bell-shaped, and held by a long, 
slender, glass-like stalk, by which they contract. A colony 
of them presents a curious sight; the bells are continually 
contracting, as if jerked from behind, the stalk forming a 
