I2 PORTER: [VoL. XIV. 
The deutomerite is unusually large, as we have seen. It is 
composed of a very loose and highly vacuolated protoplasmic 
network, which does not stain. 
The large nucleus (Pl. III, Fig. 46, 77) is usually situated, as I 
have said, in the anterior portion of the deutomerite; in living 
specimens, however, I have seen it move half the length of the 
animal. It generally contains several nucleoli, and in some of 
these, in addition to two or three vacuoles, I have noticed one 
or more very dark bodies. 
In one case I discovered a second nucleus in the posterior 
half of the animal (PI. III, Fig. 38). Here the deutomerite was 
slightly constricted just in front of the posterior nucleus; this 
certainly suggests preparation for division, and together with 
the condition shown in PI. III, Fig. 39, which looks like a recently 
divided individual, makes it seem probable that division is one 
of the normal modes of reproduction with this gregarine. 
I have found that this gregarine will live for seven or eight 
hours in sea water after being forcibly removed from the host. 
In watching the living specimens my attention was attracted 
by the very interesting movements made by the animal, which 
reveal a surprising amount of strength and a most remarkable 
manner of locomotion. 
Most of the movements can be readily accounted for by 
contractions of the cortical portion of the parenchyma or the 
circular muscular fibres. Thus the movement in the direction 
indicated by the arrow in Pl. III, Fig. 50, or from the condition 
of a to condition of in Pl. III, Fig. 51, is undoubtedly due to the 
contraction of the cortex on the convex side of the body. The 
creases in the cortex (Pl. III, Fig. 50, ~wg) are due to the con- 
traction of some of the circular muscle fibres; I believe they 
divide off successive areas of longitudinal contraction. 
This gregarine is able to obtain a firm hold on smooth sur- 
faces by using its anterior end as a sucker. On keeping a few 
of them for a time in a watch glass some have fastened them- 
selves in this manner so tightly to the bottom that they could 
not be removed without tearing them to pieces. PI. III, Fig. 
53 shows the appearance of the anterior end when fastened in 
this way to a cover glass. 
