A LEUCOCYTOZOON OF MAMMALS 111 



animal died suddenly on the morning of the day following that on which it had been brought 

 to the laboratories. It was lively and apparently xininjured the previous evening. Hat 

 niunber two also died the morning after capture. Parasites free and in the leucocytes were 

 f'onnd in smears made from tjic sj)leen, liver and kidney, but they were not at all numerous. 



Smears made from congested areas in the stomach and small intestine, and from the 

 bone-marrow showed nothing abnormal. No free motile trophozoite and no cytocyst or 

 other stage has been found. 



I have examined the bloods of many Egyptian rats [Muk Alcxandrinu») with negative 

 results. The species examined has numerous yellowish-golden hairs on the snout. 



This parasite is interesting in the light of the leucocytozilon found by Bentley in dogs 

 in India, and described by him and by James. It is closely allied to, if not identical with, the 





\ 





I 



Fig. 61.— Changks in EkviUkocYTts of jtKDOA (x 1000 di.-tm.) 



parasite recently discovered by Patton in one of the Indian palm squirrels. Captain Patton 

 has very kindly sent me a blood film containing his parasites, which very closely resemble 

 those in the Norway rat at Khartoum. I notice they are frequently found splitting the 

 karyosomes of the mononucleated cells. He has also sent me specimens of a similar parasite 

 found in the domestic cat at Madras. 



I propose to give the name of Lcucociitozoon muris to the rat parasite, which evidently 

 requires further study on the lines which have been followed in connection with the 

 haemogregarine of jerboas. 



Changes in the Erythrocytes of the Jerboa 



As stated elsewhere, granular basophilia is common in gerbils. In the blood of several 

 jerboas a somewhat similar condition has been observed, and it is shown in Plate XL, 

 Fig. «, and in Figs, (il and 62. In the last figure, besides the intracorpuscular dots and rods, 



