Tue Microscope. 249 
other fungi, and small animal life. That it is a pretty likely 
place to find Infusoria need not be said, and just what, in the 
nature of the case, one would suspect proves true on examina- 
tion. No body of fresh water known to me so teems with 
microscopic species of life as does this artificial lake, and espe- 
cially the broad, sluggish creek from the pond to the canal. 
Algze, rhizopods, infusorians, sponges, rotifers and polyzoans 
abound in profusion, both of species and of individuals. The 
Polyzoa thus far identified are as follows: Fredericella regina, 
Plumatella diffusa, P. arathusa, and Cristatella ophidioidea 
The following sponges have been found by Mr. Henry Mills: 
Spongilla fragilis, Meyenia lacustris, var. asperima, Carterius 
latitenta, and C. tubisperma. 
It is not possible to give a catalogue of the innumerable 
species of Infusoria, nor does it seem worth while, at present, 
to mention such as have been identified. It is but a short time 
since attention was directed hither, yet many striking and 
remarkable forms have been revealed. Scajaquada Creek is an 
infusorial elysium. Recent trips to its borders have been re- 
warded by the discovery of a unique species of the vorticellidan 
genus Opercularia, which I have described elsewhere (‘“ Pro- 
ceedings Am. Soc. of Mic.,” vi-119,) as O. rugosa. It is char- 
acterized mainly by its very stout, rugose, branching pedicle, 
with the numerous zooids in spheroidal clusters at the summits 
of the branches. The species whose characters are recounted 
below is not less unusual; it is one that may easily interest any 
one, specialist, student or layman. 
Sept. 20, 1884, on placing a fragment of Anacharis Cana- 
densis, taken from the creek and bearing a large colony of 
Epistylis Havicans, in a tube-vial, and examining with a hand 
lens I was easily able to separate a group as strangers to me. 
The colony stock was tall and wide spreading, equaling .13 of 
an inch in height, and bore scores of animalcules; these, again, 
were so large that they were plainly visible to the unaided eye 
whilst the simple magnifier disclosed their movements, shew 
elegant proportions, and the beautiful iridescence of the pedi- 
cle. By continuing the search other colonies were secured, and 
it was soon proven that the spreading minute trees with their 
animate fruit were not at all uncommon. The first glance un- 
2 
