Mavor & Strasser—Urinary Bladder of Wisconsin Fishes 555 
podia, and contains rather fewer granules, being more trans¬ 
parent. 
' ‘ The pansporoblast contains two sporoblasts. ’ ’ This we have 
found to be the case in the parasite of each of the four species 
of fish, but in the Lepomis pallidns the spores may develop 
singly, one in a plasmodium. 
^ ‘ The spores are ovoid bilaterally symmetrical, and have a bi¬ 
furcated caudal filament extending from the posterior end. The 
two polar capsules are situated near together in the broader, an¬ 
terior end.’^ 
We have found that there is a considerable difference in the 
dimensions of the spores in the different hosts. The following 
table shows the results of measurements: 
SPOME MEASUREMENTS IN u 
Perea 
fiavescens 
Lepomis 
pallidus 
Mlcropterus 
salmoides 
Salvelinus 
fontinalii 
Length (to end of spore cavity).. 
Tail. 
11. 
10. 
21. 
13.0 
18-28 
13.0 
18. 
13. 
30. 
Total length. 
32-42 
41. 
44. 
Width. 
7. 
7. 
7.5 
6. 
Length of polar capsules. 
3.5 
3.5 
3. 
4. 
Width of polar capsules. 
2.5 
2.5 
2. 
2.5 
Length of polar filaments. 
30-40 
The spore envelope is marked by longitudinal ridges extending 
from end to end of the body of the spore, a feature which was 
omitted in our first description. 
1). Henneguya sp. 
We have been able to identify only the spores of this species, 
which is found in the urinary bladder of Lepomis pallidus simul¬ 
taneously with //. ivisconsinensis. The spores are very like those 
of H. ivisconsinensis, but differ in the size of the polar cap¬ 
sules and the length of the caudal filaments. The dimensions of 
a typical spore are as follows: 
Length (to end of spore cavity) __14-16^ 
Tail ________ 6- 
Total Length______ 20-24/x 
Width _______ 6.5- 7 /a 
Length of polar capsule______ 8-9/a 
Width of do. do. _____ 2.5- 3/a 
