1912.] The Morphology of Trypanosoma simise, sp. nov. 481 



In addition to this, numerous division forms are seen, often four or five 

 in a field, in which the trypanosomes appear to slip past one another until 

 they are only joined by their non-flagellar ends, as shown in fig. 2. 



Fig. 2. 



Conclusions. 



1. T. simice, sp. nov., is a well-defined species, easily separated by its 

 morphology alone from the other trypanosomes which have been described as 

 causing disease among domestic animals. 



2. It sets up a chronic disease in goats, but is chiefly remarkable for its 

 rapidly fatal action on monkeys. 



3. In Nyasaland it is carried by G. morsitans, and in this district — 

 Central Angoniland — this tsetse-fly is found to be heavily infected with this 

 trypanosome. 



DESCRIPTION OF PLATE. 



Trypanosoma simice, sp. nov. — Elongated, narrow, undulating body ; posterior 

 extremity bluntly pointed or rounded ; anterior extremity pointed ; nucleus oval ; 

 micronucleus small, round, situated about 1"5 microns from posterior extremity, placed 

 laterally, protuberant ; undulating membrane marked, thrown into bold folds ; flagellum 

 frequently not projecting beyond undulating membrane, sometimes 1 or 2 microns of the 

 extremity apparently free. 



Figs. 1 — 10, T. simice from the monkey ; figs. 11 — 20 from the goat. Stained Giemsa. 

 x 2000. 



