SECTION IV, 1916 [63] TRANS R.S.C. 
Studies on the Protozoan Parasites of the Fishes of the Georgian Bay ! 
By. |. We MAvor, BA" PhD: 
(PRESENTED BY Dr. E. E. PRINCE, F.R.S.C.) 
(Read May Meeting, 1916) 
CONTENTS 
PAGE 
NAME ROCUICEION Ms yee RE cera tie ayers tase Res alte ta eon eel dE 63 
INTE ENO CS rsr RE A ore Nc TR re iat oc re eae 64 
S22 Description Glib rOLozOd LOUNG sy. #2 le g's oe Se whe hee hoc 64 
Pee Lidemoua PÉNALES RD wie ak ae ane noi tne Ile NI Bante eee 64 
Trypanoplasma borreli, Laveran et Mesnil. 
BAND OS PONS RP Gate ee ile e ter de NO 66 
a. Myxidium lieberkiihnu, Bütschli, 
from the urinary bladder of Lucius luctus. 
b. Myxosporidian from the urinary bladder of Stizostedion vitreum. 
c. Myxobolus notatus, sp. n. 
Amal levotwnshesrsearchedsat: A-.< a cence eee demeure dci eo Ue 
PRR D LOS TA DNA carted on els Rte ee ve denied etai ae de 13 
1. INTRODUCTION 
This investigation was carried on at the Biological Station of 
the Canadian Government at Go Home Bay on the Georgian Bay, 
about twenty miles from Penetanguishene, during the summer of 
1913 while the writer was curator of the station. The objects have been 
to ascertain the distribution and frequence of fish diseases in the south- 
ern part of the Georgian Bay and to determine the causal agents 
when these were protozoa. 
Fourteen different species of fish have been examined. Time and 
other considerations limited the examination in many cases to only 
a few individuals of each species. Three different protozoan parasites 
have been found. One of these, which was found in the gall bladder of 
all pike examined, is quite harmless. Another forming cysts in the 
muscles of the minnow, although injurious to the fish, is fairly rare, 
occurring in only 6% of the individuals. The last, found in the blood 

1The material for these studies was collected and part of the work was done 
while the author was curator of the Biological Station of the Canadian Government 
at Go Home Bay, Ontario. The studies were completed in the Zoological Laboratory 
of the University of Wisconsin. The writer wishes to express his indebtedness to 
the Directors of the Biological Board of Canada for the privilege of working at the 
Biological Station and the permission to publish the results here. 
