494 BIOLOGICAL STUDY OF TAP WATER. 
sight of it, and never succeeded in finding any of the same kind 
again. It was probably a species of Asterosiga, in which the monads 
are arranged in a stellate fashion. 
Another form has been doubtfully referred to the F'lagellata-Pantos- 
tomata, family Likoecidae, which includes sedentary animalcules 
with an anterior lip-like prominence, either solitary or in colonies, 
secreting separate horny loricae, mostly stalked ; flagella two, one 
long and one short ; no distinct oral aperture. In certain of its 
characters this form resembled Bicosoeca lacustris, J. Clark, and in 
others Stylobryon petiolatum, Duj. sp., while in general appearance it 
was very like a large Dinobryon. I was unable to make out whether 
there was a distinct oral aperture or not. The individuals as far 
as observed were solitary, and characterized as follows :—Lorica 
sub-cylindrical, a little more than twice as long as its greatest breadth, 
with a pedicle of about equal Jength, widest posteriorly, slightly 
everted anteriorly, tapering towards and conically pointed at the 
posterior extremity ; zooid broadly ovate, plastic, with an anterior 
lip-like prominence, occupying the posterior half of the lorica, to 
the bottom of which it is attached by a contractile thread-like liga- 
ment on which it rotates ; flagella two in number, one long and one 
short, inserted at the base of the lip-like prominence ; endoplasm 
containing two lateral greenish-yellow bands, and a reddish eye-spot 
situated anteriorly at the base of the lip-like projection ; contractile 
vesicle single, located posteriorly. Length of the lorica 0:0314! mm. 
(= sto”), and of the contained zooid 0:0171 mm. (= gsc"). Hab., 
fresh water, Lake Ontario. Fig. 7. 
Kent regards Stylobryon petiolatum as undoubtedly a compound 
modification of icosoeca lacustris, and possibly the form above 
described is a variety of the same species, considerably larger than 
the one described by H. James-Clark, if it is not a species of 
Dinobryon. 
The Cilio-Flagellata are represented by a species of Peridineum 
not determined. 
Infusoria Ciliata.—Belonging to the Ciliated Infusoria there is a 
large species of Vorticella frequently seen, either attached or free- 
swimming ; Stentor is rare; also a few Holotrichous and Hypotrich- 
ous forms, free and encysted are to be found occasionally. 
