. The Canadian field-naturalist. "»« LIBRARY THE CANADIAN FIELD-NATUR^LTS'f' # VOL. XXXV. GARDENVALE, QUE., September 1921 No. G OxN A NEW HELIOZOON FROM VANCOUVER ISLAND By Chas. H. O'Donoghue, , , Professor of Zoology, University of Manitoba. (Fi'om the Biological Station, Nanaimo, ) On the 25th of May Mrs. Eclitli Berkeley brought in some water, mnd and debris from a small pond near the top of a hill- above Hammond Bay Lagoon, about 420 feet above sea level. In this she noticed a very large Heliozoon, which she kindly handed to me for. examination. The pond is quite small
. The Canadian field-naturalist. "»« LIBRARY THE CANADIAN FIELD-NATUR^LTS'f' # VOL. XXXV. GARDENVALE, QUE., September 1921 No. G OxN A NEW HELIOZOON FROM VANCOUVER ISLAND By Chas. H. O'Donoghue, , , Professor of Zoology, University of Manitoba. (Fi'om the Biological Station, Nanaimo, ) On the 25th of May Mrs. Eclitli Berkeley brought in some water, mnd and debris from a small pond near the top of a hill- above Hammond Bay Lagoon, about 420 feet above sea level. In this she noticed a very large Heliozoon, which she kindly handed to me for. examination. The pond is quite small and shallow, surrounded by a close gl'0^^i:h of alders, and is apparently permanent. It contains a plentiful supply of several species of Algae (Spirogyra, etc.), numerous fly larvae, beetles and larvae, Copepods, Cla- docera, and Hydra vindis and a number of flagellate forms. The available literature has not yielded a description of a similar form nor is there anything like it in Wailes' excellent mono- grapli number of this order (1) or Leidy's account of the Freshwater Rhizopoda of North America. As the present organism is remarkable in several respects, it seems worthy of putting on record. The animal is of very large size and ap- pears to the naked eye as a briglit green sphere with a hyaline cover 2mm. in diameter; indeed, it was so large that it was at first thought that it miglit be a colony. Closer examination showed that this was not the case and that it was a solitary form, so that it is probably the largest Heliozoon known, the only one ap- proaching it being Acirnosphaerinm eichhornii, which may attain a diameter' of 1mm. It belongs to the sub-order Chalaro- thoraca in which the largest member is probably Raphidiophrys viridis, which (1) The British Freshwater Rhizopoda and Heliozoa, by J. Cash, G. H. Wailes and J. Hop- kinson. Vol. V, Heliozoa, by G. H. Wailes, Lon- don, Ray Society, 1921. may reach 90 micra or the colony 190 micra The present species is then a
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