700 
Transactions of the Society. 
Chilodon laliatus. Fig. 6. 
Body obovate, about twice as long as broad ; posterior border 
usually obtusely pointed, often obliquely directed, occasionally some- 
what acuminate ; lip prominent, conical in outline, directed somewhat 
obliquely upward and outward, the anterior margin convex and con- 
tinuous with the frontal border of the body, the posterior border ob- 
liquely truncate ; nucleus ovate, in the posterior body-half ; contractile 
vesicles not numerous, only two usually conspicuously developed, one 
on each side of the nucleus ; ciliated adoral line conspicuous. Length 
of body 1/500-1/665 in. Hab. pond water, with decaying vege- 
tation. 
This form, as far as the lip-like prominence is concerned, some- 
what resembles the Chilodon caudatus described by the author, con- 
spicuously differing, however, in the absence of the dorsally developed 
and rigid, tail-like prolongation characteristic of the last named form, 
which is common and abundant in the shallow waters near the 
writer’s home. 
Urostyla elongata. Fig. 7. 
Body elongated or sub-elliptical, very soft and flexible, less than 
four times as long as broad, both extremities rounded, the posterior 
often slightly the wider ; anterior lip narrow, crescentic ; peristomial 
field obovate, extending obliquely from the left-hand side of the 
anterior extremity toward the right for a distance about equal to one- 
third the length of the body, and continued internally as a narrow, 
tubular, non-ciliated pharyngeal passage extending to the body 
centra ; the right and left-hand margins of the peristome ciliated, and 
a series of long intra-oral cilia depending from the central region ; 
frontal styles numerous, the anterior the largest ; ventral styles 
fine, numerous, arranged in six longitudinal series ; marginal setae 
longest and largest at the posterior extremity ; anal styles from eight 
to ten, arranged in an oblique row, not projecting beyond the posterior 
extremity ; endoplasm brown, semi-opaque ; nucleus not observed ; 
cuticular surface roughened by minute, hemispherical elevations 
arranged in irregular series. Length of body 1/85 in. Hab. 
standing pond water. 
Urostyla fulva. Fig. 8. 
Body sub-elliptical, soft and flexible, somewhat broader anteri- 
orly, about three times as long as wide, the extremities rounded, the 
anterior lip crescentic and capacious ; peristome obovate, extending to 
near the centre of the ventral surface, the right-hand or reflected 
border finely ciliate, and bearing an undulating membrane, the left 
hand margin also finely ciliate, and a series of long, fine intra-oral cilia 
depending from the roof of the peristome region and continued through 
the narrow, tubular pharyngeal passage which is curved toward the 
