438 



S. ISHII : 



This form greatly resembles Gregarina polymorpha (Hammer- 

 SCHMIDT), but differs from it in being generally smaller, in the 

 frequent absence of protomeritc in the satellite, and in the spherical 

 shape of cysts. In G. polymorpha, so far as I know, the protomeritc 

 is always present and the cyst is of an oval shape. 



3. Gregarina crassa sp. nov. (Fig, 3). 



Fig. 3. Gregarina crassa n. sp. 360 x. 



Sporonts usually in association. 



Protomerite ovoid, relatively very small, always broader than 

 long, usually not visible in satellite. 



Deutomerite also ovoid, very large, rounded posteriorly. Satellite 

 with posterior part of deutomerite usually somewhat narrowed. 

 Between the two segments of body there exists a distinct constriction. 



Epicytc thin, especially so in protomerite. Sarcocyte very thin 

 all over, being not much thicker than epicyte. Septal region not 

 thick, inconspicuous. Endocyte almost clear in protomerite, with only 

 a few number of granules ; but very dense in deutomerite, giving it 

 a dark brownish black colour. 



Nucleus usually situated near the middle of deutomerite. It is 

 only vaguely visible owing to the great denseness of the endocyte. 



Measurements : 



Average association : 



