424 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 Aslerosiga, in which the monads 

 are arranged in a stellate fashion. 



Another form has been doubtfully referred to the Flagellata-Pantos- 

 tomata, family Bikoecidae, 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, Buj. sp., while in general appearance it 

 was very like a large Dinobryon. I was unable to make out whether 

 thei'e^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 length, 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 - 03143. mm. 

 (= s^o"), and of the contained zooid 0-0171 mm. (= -rwuwa")- Hab., 

 fresh water, Lake Ontario. Fig. 7. 



Kent regards Stylobryon petiolatum, as undoubtedly a compound 

 modification of Bicosoeca 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 C ilio-Flagellata are represented by a species of Peridineum 

 not determined. 



Infusoria Giliata. — 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. 



