403] STUDIES ON GREGARINES— WATSON 193 



extremity is bluntly rounded. The protomerite of the satellite does not 

 show the constriction which characterizes that of the primite. It is low 

 and flat and slightly wider than long. The constriction at the septum is 

 not as deep here as in the primite. The attachment of the two sporonts of 

 an association is very insecure. 



The nucleus is large and spherical, often being in diameter half the 

 width of the deutomerite. It is conspicuous in sporonts of all ages. The 

 protoplasm is very dark in color — often black in the deutomerite but it is 

 not as dense as that of many gregarines. It readily accumulates in 

 masses, leaving clear spaces between. The protomerite is much less dense 

 and tan in color; the portion above the constriction is almost devoid of 

 protoplasm. The epimerite is spherical and very large. Myonemes are 

 large and conspicuous, even in the adults. Movement is active. Cysts 

 were not recovered. 



A table of the more important measurements follows with dimen- 

 sions expressed in microns: 



Total length association 610 600 550 



Primite : 



Length protomerite _ 70 



Length deutomerite „ 230 



Width protomerite -. 110 



Width deutomerite _ 110 



Total length sporont _ 300 



Ratio 



length protom. : total length 1 :4.3 



width protom. : width deutomerite 1 :1 



Satellite : 



Length protomerite 50 



Length deutomerite 260 



Width protomerite 100 



Width deutomerite 100 



Total length sporont 310 



Ratio 



length protom. : total length 1 :6.2 



width protom. : width deutomerite 1 :1 



This species is almost unique in the possession of a deep constricting 

 groove in the protomerite of the primite. This feature, together with the 

 long cylindrical deutomerite, readily differentiates it from other species. 



