INTERCELLULAR GRKGARIX A POLYMORPHA 



28 [ 



and has taken for an early developmental stage of Gregarina poly- 

 morphs, may \>z nothing else than cell-inclusions of the kind above 

 referred to. 



One the other hand, the intracellular gregarines are mostly larger 

 than cell-inclusions. They may readily be classified into two kinds : 

 (a) those in which the protomerite and deutomerite are ahead)' formed 

 and (Ò) those in which this differentiation has not yet taken place. 

 Smaller individuals of the latter kind nearly equal the larger meta- 

 plasmic cell-inclusion in size, and are usually plainly confined each 

 within a single epithelial cell, while larger individuals frequently appear 

 to extend through a space of two or more cells. 



The non-differentiated intracellular gregarines are as a rule of an 

 ovoid shape. Rarely the smaller forms show one end of the body 

 more or less pointed. These are probably to be considered to be old 

 sporozoites, the pointed end representing the remnant of the rostrum. 



In the full grown and well differentiated intracellular gregarines 

 the protomerite is nearly hemispherical, while the deutomerite presents 

 the form of a short cylinder. Between the two segments of the body 

 there always exists a distinct constriction. The width is nearly the 

 same throughout the whole length of body, or the protomerite is a 

 little narrower than the deutomerite. In length the latter is 2-4 times 

 longer than the former. But the size of the protomerite in relation to 

 that of the deutomerite is considerably larger in the intracellular 

 gregarines than in the adult free sporonts or in associated individuals. 

 Measurements taken from a medium-sized intracellular individual with 



protometite and deutomerite, are as follows : — 



Length of body 18 n 



Length of protomerite 5 u 



Length of deutomerite 1 3 /i 



Width of body (measured at the widest part 



of deutomerite) 8 [i 



Diameter of karyosome 3 ft 



