42 A. @. Stokes—Fresh-water Infusoria. 
small refringent corpuscles scattered throughout the body; anal 
aperture dorsally located, at a short distance in advance of the 
posterior extremity. Length of body ;4, to 34, inch. Hab- 
itat—Standing water, chiefly among the decaying debris on the 
bottom. 
Another infusorian, but a member of the Ciliata-Heterotricha 
whose appearance is attractive and its motions graceful, 
taken in small numbers from the debris at the bottom of the 
aquarium referred to. Its movements are not rapid, consisting 
‘chiefly of a steady progression by swimming usually on the 
right-hand side, or by rotation upon its longitudinal axis. 
There is, so far as I am aware, no infusorial genus capable of 
receiving it; I therefore take pleasure in naming it in honor of 
my learned friend, Mr. Austin C. Apgar, Professor of Zoology 
in the New Jersey State Normal School. 
garta, gen. nov.—Body irregularly ovate, more or less 
flattened or lamellate, entirely ciliate, soft, flexible, transparent 
expansile and ciliated; the left-hand edge of the peristome 
eee of the right-hand margin occupied by a conspicuous, 
amellate, undulating membrane; cuticular cilia fine, cloth- 
ing the longitudinal surface furrows; nucleus moniliform or 
rounded, subcentrally located; contractile vesicle single or 
double, posteriorly placed; anal aperture posterior, near the 
pulsating vacuole, 
pgaria undulans, sp. nov.—(fig. 2).—Body leaf-like and 
