683 
Each of the three specimens of the host of this species examined 
was considerably infected. 
The most unique structure noted in connection with this species 
was the expansible papilla at the anterior end of the protomerite. This 
papilla was expanded at irregular intervals, for periods of from a few 
seconds to a minute or more. The process of expanding could be com- 
pleted in about ten seconds although it usually consumed thirty to forty 
seconds. When completely expanded the papilla was very mobile. As 
this structure was moved about in all directions both by moving grega- 
rines and by those at rest it probably has no connection with the loco- 
motion of the individual. Its movements on the other hand were such 
as to suggest a tactile function. The expansion of this papilla seemed 
the result of the outflowing of the sarcocyte. As the process was ob- 
Figure 2. Stenophora cockerellae. Anterior portion of a 650 u gregarine showing 
three stages in the expansion of the papilla. "F” was drawn from a completely ex- 
panded specimen. 
served under the microscope it resembled the formation of a pseudo- 
podium by a Rhizopod like Amoeba except that the endocyte did not 
enter the papilla. The anterior margin of the endocyte of the proto- 
merite did change form however. In individuals in which the papilla 
was not expanded the anterior margin of the endocyte was always more 
or less concave away from the papilla (see fig. 3). The first apparent 
step in the expansion of the papilla was the obliteration of this concavity 
in the endocyte correlated with a thickening of the epicyte in the collar 
region above the septum. Fig. 2 D shows a gregarine in this stage. With 
the enlargement of the papilla the endocyte of the protomerite became ‘ 
more and more convex towards the papilla until the maximum expansion 
was attained (figs. 2E and 2F). This process would naturally force out 
the sarcocyte in front of the endocyte producing the expanded papilla if 
there where any portion of the epicyte in that region elastic enough to 
give under the strain. Fig. 3 shows the anterior end of the protomerite 
of a cleared specimen highly magnified. It may be noticed that the 
