1(JU A h.i:mogi{F.oakink of mammals 



Liivcruirs cliissificiitioii,* in wliicli the gcmis If<iiiio(/i-i;iitrini' is niinlc to iiu-liide 

 Drfpiiiiitliiim ii!icl Kari/uli/KHK, is mure sinipli', but wliichcviT hv uilupted, it would seem that 

 this parasite is nndouhtedly a lia'inogregarine, and I liad proposed to give it the provisional 

 name of //. Juriili, tliougli it is i|iiitc |ii)ssililc it may lie fmnid in otlier muiiiniiils. I'mfessor 

 Laverall. wliose nunn'inliiturc takes precedenee lias, however, detinitelv named it //. /Sii/jniiri.f 

 A study of its life-history has fiirtiier indieated its relation to the Uii iiuiyniiariiiiilii . fur 1 

 Imve sneeeeded in liuding two further stages, ix. : — 



(1) The free, motile verinicule form. 



(2) The stage of sehi/onts in the form of eytoeysts. 



I. In three instances only have I found the free tropliozoite. I diseovereil two 

 sueli forms in the peripheral hlood of a jerliua, wliiili slu)wer| the endoglohular trophozoite in 

 fair nuiiiliers and wliirh liad sduie injections of the serum of a water-buck in connection with 

 trypanosome work; I caiiu' across a vermicule in the fresli heart's blood of another of the 

 desert rats, and in the peripheral blood of a case with severe infection I noticed several of 

 these forms. This free form is in length about three times the diameter of a red blood 

 corpuscle, is pointed at both tinls, and moves very slowly through the blood, progressing by 

 a series of contractions of its cytoplasm, the so-called '" eugleiioid " movements. As a result 

 constrictions appear in the body of the parasite, as many as three having been seen present 

 at one time. These, so to speak, run along tlie body of the parasite, which thereafter 

 a.ssunies its usual cvlindrical shape and glides steailily across the titdd, always proceeding in 

 one direction ami with the same end in front. It pauses for greater or longer periods. 

 The vermicule undergoing various alterations in shape. If it encounters a clump of red blood corpuscles 

 it disappears amongst them, producing only a slight agitation amongst the erythrocytes, 

 which it pushes out of its way. (iranules are visible in the posterior part of the body. No 

 flagellnm has been seen nor anything to suggest the extrusion of a gelatinous thread, as 

 occurs in the case of .some of the gregarines. I was able to secure several stained 

 preparations of this free trophozoite, the appearance of which further demonstrates its 

 resemblance to a hiemogregarine. (Plate XI.. Fig. li.) 



Anteriorly there is a somewhat sharp-pointed area staining a light blue in which, 

 close to the nucleus, a chromatin dot is visible. Following this clear area conies a very 

 lengthy, oblong, deeply-stained nucleus. At one point it showed a constriction similar, no 

 doubt, to those seen in the fnsh preparation. It had been killeil. tixe(l, and stained in the 

 act of progression. 



Behind the nucleus is a lengthy, light-staiuing area, terminating in a pointed extremity. 

 This area stains a light blue with the Leishman stain and exhibits a cluster of chromatin 

 dots, arranged in a somewhat rosette form immediately behind the nucleus. I noted a single 

 central dot with six others arranged in a circh- around it. A few similar dots, irregularly 

 arranged, are also visible close to the posterior extremity. 

 Measurements : — 



Total hngth 155 ft 



Length of nucleus .'. .. .. .. '' f 



Length of anterior light area . . . . 2"8 /j 



Length of posterior light area . . 57 /i 



(ireatest breadth . . . . . . . . . . . . 2'8 ^• 



• C. U. Soo. Biul. (I'liriH), I'.lol, \>. 79S. 



t C. R. Acad. Siitiici-s, Vol. CXLl., p. 295, 1905. 



