THE CILIATE INFUSORIA. 35 
ers, so that when the organism has by means of its hollow 
arms or tentacles caught some 
Infusorian, the arms con- 
tract, draw the victim nearer 
to the Acineta, and when the 
sucking disk at the end of the 
arms has penetrated the skin, 
the contents of the body of 
the Infusorian are sucked into c! 
the food-cavity of the Acine- y 
fa; on the other hand, in 
some Acinetee a portion of the 
arms are simply prehensile. 
These animals are in: their 
adult phase quite unlike the 
Flagellata or Ciliata, but the , 
young are developed within ™ 
the parent and are provided 
with cilia, being at first free- 
swimming, and afterward 
fixed by a long stalk. The 
Acinete sometimes self-di- 
vide, sending off from the 
free end of the body a ciliated 
Acinete ; they have also been 
seen to conjugate. 
Order 3. Ciliata (Infuso- 
ria).—A common type of this 
group and one easy to obtain 
by the student is Parame- 
cium (Fig. 24), observed in 
infusions, or moving rapidly _ ; 
over the bodies of larger ani- wien tom ie dora ele mnifted aid 
mals which may be under the fhe mouth; mto g, the throst; a, the pos. 
microscope. Fi gure 94 rep- terior opening of the digestive cavity; cv! 
the eee ea Boar conteaptne 
7 . vesicles; I, II, III, the radiating canals o 
resents Paramecium cauda- oo nthe reproductive organs, 
i j- large vibrating cilia at the edge of the vées- 
tum Ehrenberg. Tie. ani dares ibraiing cilia 2b ie ed 
malcule is a mass of proto- 
plasm, representing a single cell. In the body-mass are ex- 
cv 
