556 Wisconsin Academy of Sciences, Arts, and Letters. 
The capsules contain about ten coils of filament, 
c. Myxidium lieberkuhni Butschli. 
A full description of this species as found on the American 
continent has been given by the senior author Mavor (1916). 
A complete list of references is given in Auerbach (1910). 
The dimensions of a typical spore are here given for compari¬ 
son with the species to follow. 
Length---18-19/x, 
Width__________ 5- 6/a 
Length of polar capsules___ 5/a 
Width do. do. _2.5-3.0/x 
Length of do. do. _ 40-45/a 
d. Myxidium salvelini n. sp. 
The plasmodium is large measuring as much as 75/a. The 
pseudopodia are lobose. 
The pansporoblasts, of which there may be many in a single 
plasmodium, contain two sporoblasts which each develop into 
one spore. 
The spores are spindle shaped with a polar capsule at each 
end. Each capsule contains about three coils of a rather thick 
filament. The dimensions of a typical spore are: 
Length ________ 11/a 
Width __— 4/a 
Length of polar capsule - _ 3/a 
Width of do. do. ____ 2.5/a 
The parasite occurs in the urinary bladder of Salvdinus 
fontinalis simultaneously with Henneguya wisconsinensis. 
LIST OF HOSTS OF MYXOSPORIDIA IN THE 
URINARY BLADDER 
HOSTS 
MYXOSPORIDIA. 
Henneguya unsconsinensis 
Lepomis pallidus Mitchill 
Mavor and Strasser. 
do. 
Henneguya sp. 
Lucius lucius L. 
Myxidium lieberkuhni Butschli 
Micropterus salmoides 
Henneguya wisconsinensis 
Lacepede 
Mavor and Strasser. 
Perea flavescens Mitchill 
do. do. 
Salvelinus fontinalis Mitchill 
do. do. 
do. 
Myxidium salvelini n. sp. 
