732 H. iM. \VOO)jC()(JK. 



spindle-like prolongations. The desci-iptious of these forms 

 are to be found in a series of notes by Mathis and Leger (10a- 

 IOd). I wish to point out that as regards one at any rate, 

 and possibly more than one, of their parasites, the authors, iu 

 describing the gametocytes (and their host-cells) as rounded, 

 appear to have been dealing simply with individuals which 

 had begun the active process of rounding themselves oft" pre- 

 paratory to rupturing the host-cell and becoming liberated as 

 ripe gametocytes. Now, in preparations of the fusiform 

 species (L . ziemanni and others), which show gametocytes 

 caught iu this act, it is generally impossible to recognise any 

 longer the typical fusiform shape, the cytoplasm of the host- 

 cell having been quickly disorganised. 



In the case of Mathis and Leger's forms L. cauUeryi (a 

 rounded form) and L. sabrazesi (spindle-like), both from 

 the same host, namely a fowl (Tonkin), I feel sure that the 

 latter parasite is the typical intra-cellular form of the former. 

 Thanks to the authors' kindness in sending some of their 

 preparations of these parasites to the Lister Institute, I have 

 been able to compare them. On a slide containing L. 

 caulleryi all the individuals found are quite rounded-ott', 

 and, moreover, there is no sign of the host-cell in connection 

 with them, i.e. the latter has been ruptured and dis- 

 organised, and the parasites are seen as ripe, free gametocytes. 

 A slide containing L. sabrazesi, on the other hand, shows 

 the parasites still within their host-cell, the latter having the 

 usual spindle-like prolongations. Mathis and Leger them- 

 selves say, in their note on L. caulleryi (10a), that only 

 exceptionally did they see the nucleus of the host-cell — 

 evidence that the latter had been ruptured and disorganised. 

 Hence I myself have no doubt, especially when the fact of 

 these two parasites being found in tiie same host is considered, 

 that L. sabrazesi is only a synonym for L. caulleryi, and 

 that this species (L. caulleryi) belongs really to the fusi- 

 form group. 



On the other hand, in the case of the species I have 

 described, L. f ringilliuarum, there is no doubt that it is 



