De ae UP eee 
A. C. Stokes—Fresh-water Infusoria. 319 
“elle is conspicuously gregarious in habit. It is shown in 
g. 6, 
Derepyxis ollula, sp. nov. 
Lorica broadly flask-shaped, one and one-half times as long 
as broad, centrally subspherical, slightly narrowed at the pos- 
terior extremity, the neck-like portion subcylindrical, one- 
fourth as long as the entire lorica, the circular border not 
everted; pedicle short, stout, in length about one-eighth the 
entire height of the lorica; enclosed zooid spherical, the ante- 
nor border rounded; lateral color bands as in D. amphora; 
flagella of equal length; contractile vesicles posteriorly located, 
ut not terminal. ight of lorica z/yz inch; diameter of 
enclosed zooid : itudi i 
Habitat.—Pond water; attached to confervoid filaments. Soli- 
lary or few together. 
his infusorian conspicuously differs from the preceding in 
the shape and size of the lorica, and in the more spherical 
Contour of the enclosed zooid with its evenly convex frontal 
tder. The tint of the color bands is about that of D. 
‘mphora; they are similarly broad, and also usually obscure 
the colorless central sarcode. The lorica and enclosed zooi 
are shown in fig. 7. It does not so abundantly ornament the 
‘tpporting algal filament as does D. amphora, neither is it so 
frequently met with in the habitat preferred by both. 
Chilomonas ovata, sp. nov. 
osing numerous dark-bordered corpuscles; flagella sub- 
vi exceeding the body in length, inserted close together at 
© anterior apex ; contractile vesicles two, pulsating altern- 
itely, situated near the frontal margin; nucleus ene 
ace : ; 
laced. Leneth o ody gyxq to 
foned, in company with a greater number of its comparatively 
Sigantic relative, the Chilomonas paramecium Ehr. is 
readily distinguishable from the latter by its much smaller 
Size, it indeed being the most minute fresh-water species yet 
"ecorded, by its long flagella, and particularly by the presence 
of two contractile vesicles, and the almost obsolete bilabiation 
of the frontal apex. The latter is so obscure, the border at 
mes even appearing to be slightly pointed, and the contractile 
Vesicle is so conspicuously double, that IT have with some hesi- 
tation identified the infusorian as a member of the genus Chilo- 
