BLOOD-PARASITES OF FISHES OCCUEEING AT EOVIGNO. 151 



trophonucleus o£ a try panose in e, in being of the karyosomatie 

 type. Further, Berliner mentions and figures the occurrence 

 at times of a distinct extra-nuclear granule, connected by a 

 fibril with the main nucleus, which he regards as representing 

 the kinetonuclear element of a ti-ypanosome perhaps in a 

 somewhat reduced ("' riickgebildet ") condition, consequent on 

 the intra-cellular, " resting '^ condition of Halteridium. We 

 are very pleased to have this independent confirmation, and 

 from iron-hsematoxylin preparations, of the occurrence of 

 nuclear dimorphism in Halteridium, a feature which one 

 of us (H. M. W.) has already described (23) in the case of 

 another species parasitic in the chaffinch, though unfortu- 

 nately in this instance only Giemsa-stained smears were 

 available. There can be little doubt, therefore, that Halteri- 

 dium, in regard to its nuclear structure at all events, shows 

 very much closer afiinity to the trypanosomes than do the 

 hsemogregarines. 



Lister Institute ; 



November 27th, 1909. 



Bibliography. 



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