INFUSORIA. 51 
sentially the same as Paramecium in structure, consisting of 
granular sarcode, with vacuoles, a nucleus, and a contractile 
vesicle. The end of the cup furthest from the stalk terminates 
in a rounded aperture, through which there can be protruded a 
ciliated disc (fig. 12, 6). On one side of this disc isthe aperture 
of the mouth, leading into a kind of gullet, which is also fur- 
nished with large vibrating cilia. This, in turn, opens directly 
into the soft granular sarcode of the abdominal cavity, which 
exhibits a constant though slow rotation. 
Fig. 14.—Ciliated Infusoria. a Vaginicola; 6 Stentor Miilleri, the Trumpet 
Animalcule ; c Group of Vorticelle; d Detached bud of Vorticella. 
A still commoner and equally beautiful example of the Stalked 
Infusoria is the so-called Bell-animalcule (Vord¢ceZ/a, fig. 14, ¢), 
which may be found in any stagnant pool attached to the stems 
of aquatic plants. The body in Vorticella forms a kind of cup 
or “calyx” supported upon a long stalk, which is in turn fixed 
to some solid object. The stem contains a contractile fibre in 
its interior, and the animal can by this means push itself out or 
coil itself up with the utmost rapidity. The vibrating filaments 
or cilia are not scattered over the whole surface of the bell- 
shaped body, but are collected to form a kind of fringe or circle 
round the mouth of the calyx. Nearly in the centre of this ring, 
or on one side, is placed the aperture of the mouth, which leads 
by a short gullet straight into the central soft sarcode of the 
interior of the body. A nucleus and contractile vesicle are also 
present, so that in the essential points of its anatomy Vordzcella 
does not differ from a free-swimming Infusorian such as Para- 
