348 H. M. WOODCOCK. 
the body, would be more distinguishable in such. I was not 
able, however, to satisfy myself of the existence of such an 
organella. I am uncertain whether there is one or not; it 
may be that I have not been able to discern it owing to its 
contiguity to the general cytoplasm. 
In certain respects the structure of these gametes does 
undoubtedly agree with that described by Schaudinn. At 
one end, which is abruptly rounded, there is an unmistakable 
granule, which stains more deeply than the neighbouring 
cytoplasm (text-fig. 13, .). This organella is apparent in most 
of the individuals observed, and most probably corresponds to 
the anterior centrosome of Schaudinn. The opposite end is 
TrxtT-FiGc. 14. 
Dividing parasite, probably giving rise to small Halteridia; 
from the bone-marrow. K. Kinetonucleus, or kinetonuclear 
eas T. Trophonucleus, or trophonuclear element. X 
finely tapering, and comparable to the cytoplasmic tail. I 
have not been able to make out any elaborate nuclear details, 
but I am inclined to think a kinetonuclear body can be 
distinguished ; at all events, one of the chromatic masses, of 
which there appear to be three or four, is usually larger and 
more deeply-staining than the others (cf. fig. 18). 
In conclusion, I have a few words to add with regard to 
the origin of the minute intra-cellular Halteridia. Two 
or three weeks after this series of preparations was made, 
I saw for the first time Aragao’s account! of his work 
on the Halteridium of the pigeon. Aragao has found 
that the very young forms, which enter the red blood- 
corpuscles, originate by the multiple division (schizogony) of 
large parasites which occur in the endothelial cells of the 
lung-capillaries. This worker thinks that the form or phase 
1 «Arch. Protistenk.,’ 12, p. 154, 1908. 
