100 
A NeiD Gregarine 
externally of a hyaline ectoplasm limited by a cuticle, and internally of 
a finely granular endoplasm. 
At a variable position in the endoplasm of the deutomerite lies 
the now oval nucleus in which the central skein of chromatin is 
also oval and not so closely woven as in the nucleus of the younger 
forms, so that its band-like structure is more distinct. Later on this 
becomes completely opened out into a riband lying across the nucleus 
(Fig. 7), and about this time there appears in the “ karyolymph,” usually 
at the anterior end of the nucleus, one or two small spherical bodies 
(Figs. 5, 8), the structure and function of which I have been unable to 
determine. I shall merely describe what I have seen with regard to 
these spherical bodies. They are achromatic and of variable size and 
may occur singly or in pairs lying side by side. I have not been able 
to see any indication as to how they arise, beyond the fact that the 
larger of them sometimes show other similar bodies inside themselves, 
which is some indication that fresh ones were being formed by budding. 
(See Fig. 15.) 
Fig. 8. 
Fig. 5. Adult trophozoite. 
Fig. 6. Epimerite of (a) free, (b) attached trophozoite. 
Fig. 7. Chromatin band in the nucleus of a trophozoite. 
Fig. 8. Nuclei of medium-sized trophozoites showing spherical “polar bodies.” 
The sporont (Plate IV and Fig. 9). When the adult trophozoite loses 
its epimerite, as it finally does, it lives free in the gut as a sporont, 
having an average size of 175 x 75 /r. At first the sporont is elongate 
like the trophozoite but eventually it swells greatly and the nucleus 
then passes backwards. The ectoplasm of the protomerite develops 
a thickened cap at its anterior extremity: the endoplasm is densely 
granular and appears brown to transmitted light. The granules of the 
endoplasm are not of the usual nature found in gregarines, as they do 
not consist of paraglycogen, or fat: some of them appear to be chromatic. 
