27 
tomerite is some distance, (not to exceed the length of the protomerite), 
behind the septum. 
Nucleus nearly as large as the protomerite in small and medium 
specimens; in large specimens often partly or completely obscured by 
the opacity of the endocyte. It is usually found posterior to the middle 
of the animal in small specimens, and anterior to the middle in large ~ 
ones, although by pressure it may be shifted. 
Epicyte thin and very flexible. 
Sarcocyte very thin and clear; present over the entire animal; 
thickest at the posterior end of the deutomerite, just behind the septum 
in the deutomerite, and in the anterior portion of the protomerite. 
Endocyte quite clear in the small individuals, varying to very dense 
in the large gregarines. It is not found beyond the basal fourth of the 
epimerite. It fills rather completely, however, the other portions of 
the body. 2 
Fig. 2. 
Figure 2 shows the epimerite, protomerite, and a portion of the deutomerite of a 
small specimen, (600 « body length), highly magnified. 
Usually in groups of three or more, although no associations are 
formed. Often ten or more individuals of various sizes are found in a 
group with the posterior ends of the deutomerites together. Such col- 
lections when examined showed no actual connection existing between 
the individuals. The large gregarines were especially active, being able 
to bend the body in any direction. They were often noticed to assume 
the shape of a large ”S“ and then straighten again rather rapidly. 
Many pairs of large individuals were found with the two proto- 
merites partly fused by a head to head union of the two specimens. 
This seemed to be the first stage of conjugation although the succeeding 
stages have not been followed as yet. 
Sporocysts large and subspherical. 
This species is distinguished from 8. longicollis St., by its much 
shorter epimerite which possesses a relatively longer point. It is a longer 
and slimmer species than S. gladiator Blanchard, to which it is most 
closely related. The epimerites of the two species also differ, that of 
S. giganteus having a slightly globose enlargement at the base of the 
apical part. 
