314 H. B. FANTHAM. 



tlie rod in its middle portion being not quite sharp, but a 

 little irregular. Notliing in the nature of chromosomes could 

 be definitely distinguished, nor reduction division with 

 certainty. The blepharoplast (text-fig. 33) had divided into 

 two dots, lying side by side and still touching, at the peri- 

 phery of the parasite, away from the dividing nucleus. A 

 vacuole was present near the latter. 



Text-figs. 34 and 35 represent ovoid forms, suggesting 

 parasites in process of division. Each contains several 

 chromatin masses of varjaug size, and more or less peripheral 

 in position. In text-fig. 34 the relative sizes of the four 

 chromatin masses suggest the presence of two nuclei and 

 two blepharoplasts. 



(»)) Other Intra-corpuscular Forms. 



In text-fig. 36 is shown a rare form, consisting of two intra- 

 corpuscular parasites, closely approximated at one end, which 



Text FIG. 36. 



36 



may be termed rod-shaped, but are really more like a dumb- 

 bell or spoon in outline. Bacillary or rod-like forms of 

 P. bigeminum are known, but from immune cattle (Theiler). 

 The parasites drawn in text-fig. 36 may possibly be pyriform 

 ones seen edge-on. Two masses of chromatin, one larger than 

 the other, were seen in each parasite situated near the ends. 



Irregular forms are very rare. Nuttall and Graham-Smith 

 (8) describe intra-corpuscular parasites showing processes in 

 stained preparations and also in the living condition, and 

 remark (more especially concerning free parasites) that cyto- 

 plasmic processes seen in living parasites are often not found 



