98 Lake Maxinktickee, Physical and Biological Survey 



to be composed of colonies of Vorticella, were found very abundant 

 on the submersed tips of Ceratophyllum leaves at the Inlet. Late 

 in the autumn of 1904 (October 31, November 2 and 16), the same 

 objects were noted, but in considerably longer and larger patches, 

 on various weeds, such as Myriophyllum, etc., in the vicinity of 

 Winfield's. Again, in the autumn of 1906, they were exceedingly 

 abundant in various weeds, especially dying leaves of Vallisneria, 

 in Outlet Bay. So far as we have observed, these organisms seem 

 to increase greatly during the autumn. Both white and green 

 colonies were found, alike in everything except color, and it is 

 probable that they were the same species under different condi- 

 tions. The green forms showed distinctly against the dead Val- 

 lisneria leaves, which had faded to a papery white. It may be it 

 was common during the summer, but concealed by its green sub- 

 stratum. June 22, 1906, it was plentiful on the weeds in Lost 

 Lake. 



In a note of June 26, concerning this species occurs the remark : 

 "This is a larger sort; there are also other smaller isolated ones 

 present." On July 25, and previously, it was common in both 

 lakes in weedy, stagnant places, forming a white halo along stems, 

 not in balls. In addition to these there are minute green Vorti- 

 cella-like organisms attached to the parasitic copepods on the gills 

 of fishes, and on August 28, 1908, a number of minute clear Vorti- 

 cellas were found on the body of a Cyclops. A species of Vorticella 

 was abundant July 31, 1906, on Anabsena in plankton scum. Small 

 Vorticellas are found in myriads on objects in Hawk's marsh. 

 They can be found there more abundantly than anywhere else 

 about the lake. 



12. EPISTYLIS sp. 



A species of Epistylis, probably plicatilis Ehrenberg, was ob- 

 served forming a dense growth on the shells of a small Planorbis, 

 March 25, 1901, near Chadwick's pier. 



The copepods of the same region at that time presented a very 

 fuzzy appearance, and upon examination were found to be thickly 

 overgrown with the same or a similar protozoan. 



13. OPERCULARIA IRRITABILIS Hempel 



Abundant during the summer and autumn of 1906, upon the 

 lower surface of the shell (plastron) and also on the skin of various 

 turtles, especially the painted and snapping turtles, making a close, 

 short, brown, fuzzy growth. The turtles were botanic gardens 

 above and zoological gardens below. The organisms seemed to do 



