80 
a milky white by reflected light. It is divided into two equal halves by 
an equatorial depression. After the cyst has been expelled from the 
host for about six hours this equatorial constriction disappears whether 
the cyst be kept moist or not. Asa result of the complete fusion of the 
two halves the cyst proper becomes a regular sphere. Many cysts when 
first discharges from the host were already in this stage showing that 
the complete fusion may take place within the alimentary canal of the 
host. The measurements of three average cysts taken immediately after 
their discharge from the cricket may suffice to show the relative and 
absolute thickness of the cyst and its envelopes. 
Total diameter | Outer envelope | Inner envelope | Cyst proper 
560 96 | 15 338 
640 150 10 320 
512 70 8 356 
The variation in the diameter of mature cysts exclusive of their 
envelopes is shown in the following series of measurements taken from 
Fig. 14. 
Figures 1 to 4. Cysts of @. longiducta. 
Figure 1. After 30 hours in water, showing the light peripheral zone. 
Figure 2. Side view at end of 48 hours. 
Figure 3. Polar view at the end of the third day. 
Figure 4, Side view of 3, showing the conical more dense mass in the center and at 
the pole opposite that surrounded by the sporoduct-buds. 
seventeen cysts which were contained in a single mass of excrement. 
These cysts were kept after being measured until sporoducts formed 
that their maturity might be established. Their diameters were 195, 
