302 
A New Gregarine 
Sporont (Fig. 4 B and E). 
The sporont is solitary, and when mature measures on an average between 
190 and 220/z. The largest specimen seen attained a length of 250/z. The 
sporont is elongated, and its length is about four or five times its width. 
The protomerite is roughly hemispherical, but somewhat pointed at the anterior 
extremity. There is a well-marked constriction at the septum. The deutomerite 
is cylindrical, tapering away gradually towards the posterior extremity, and 
ending in a blunt point. The protoplasm is granular, and in the mature 
specimens very dark in colour. 
Fig. 4. A, section through a sporont showing nucleus with karyosome and chromatic granules. 
B, section through a cephalont showing karyosome in act of budding. C, section through an 
abnormal cyst formed by three sporonts (diagram made by combining several successive 
sections of a series). D and E, stages in encystment—in D the septa of the sporonts are still 
distinct, in E they have disappeared, x 667. 
The nucleus is just visible in the living specimen, more especially if the 
animal be slightly compressed. It is spherical in shape, and is most often 
situated towards the anterior end of the deutomerite: its position, however, 
is variable. The stained preparations show a spherical nucleus with a single 
large vacuolated karyosome, and a number of chromatic granules (Fig. 4 A). 
Cysts. 
The encystment of the sporonts takes place in the mesenteron of the larva. 
The cysts are evacuated at an early stage before the nuclei of the two sporonts 
have divided, and the young cysts may be observed in the rectum. The newly- 
formed cysts are very dark in colour, and in the living specimens the nuclei 
of the sporonts are only just discernible. 
