343 
often measured twice the diameter of the rest of the parasite (fig. io). 
Rounded parasites measuring from 3 /* to 5// or more in diameter with 
irregularly distributed granules and no clear areas occurred (figs. 11 
and 13). The smaller rounded forms can divide transversely; 
apparently after a concentration of the chromatin (fig. 12). 
It seemed possible that this parasite should be placed amongst 
the Myxosporidia. In recognition of the collaboration of Dr. Inge 
Heiberg in the work of our expedition, and in particular of his 
observations on T. loricatum . we suggest for the name of this parasite 
Myxosporidturn heibergi. About half of the tsetses dissected at 
Leopoldville had these parasites free in their midgut. In the stomach 
wall of one freshly caught fly coccidian-like cysts were seen. (“ Corps 
en bardletcompare the parasite of Pyretophorus costalis described 
above).* 
EPILOGUE 
Although the facts presented in this paper are admittedly the 
results of passing observations, incomplete, disconnected, and made 
under unfavourable circumstances, we think that they possess a 
certain value as a record alone of protozoan infections encountered by 
chance during three years’ work in Africa. Many of the appearances 
noted, though incomplete in themselves, are of additional value in 
that they confirm the constancy of morphological changes noted in 
other allied and better studied parasites. 
The following examples are cited. Longitudinal stnations have 
been seen in every trypanosome examined ; the myonemes of ot er 
authors are, therefore, constant in the trypanosomes we have dealt 
with. In several instances the thickened edge of the undulating 
membrane of trypanosomes has been observed to terminate, not in 
the blepharoplast, but in a lighter-staining pinkish granule, or pair o 
granules, closely applied to it. In some of our trypanosomes 
structure of the nucleus and the occurrence, m neighbouring 
differentiated areas, of paired chromatophilic granules suggests a 
connection with the complicated nuclear developmental phenomena 
observed in trypanosomes by some observers. The clear, unstame 
•Thisis the last of the parasitic protozoa 
tarabia and the Congo. The filariae found in va by 5 Professor. H. E. 
nd reptiles will be considered in a forthcoming paper o> 
tnnett. 
