258 Glossina palpalis and Trypanosoma gambiense, etc. 



very large female form. These two forms occur in flies which have not fed on blood 

 for a long time. Fig. 35, very long form, with nucleus consisting of eight chromosomes. 

 Figs. 36 — 40 are all from the same fly. Figs. 36, 37, and 38 show the nucleus broken up 

 into separate chromatic granules, and the varying position of the blepharoplast. Fig. 39, 

 young form showing regular division of the nucleus into eight chromosomes. Fig. 40, 

 young form showing a separate mass of chromatin posterior to the nucleus. 



Plate 14. — Trypanosoma grayi, figs. 41 — 52 ; Trypanosoma tullochii, figs. 53 — 60 ; all 

 from the gut of the tsetse fly (Glossina palpalis). Fig. 41, very large female form, 

 undergoing unequal division, from a fly which had not fed on blood. Fig. 42, 

 rosette-like mass of similar young forms. Figs. 43 — 51 are all taken from the same 

 fly, and show the various steps in the formation of circular non-flagellated forms from a 

 common type, fig. 43. Figs. 44 and 45 show the flagellum becoming wrapped round 

 the body of the parasite. Figs. 46, 47, and 48 show progressive stages in the absorption 

 of the flagellum. Figs. 49, 50, and 51 are different types of the resulting non-flagellated 

 bodies. Fig. 52, an uncommon type of parasite, with very large blepharoplast, and 

 showing much chromatic granulation, from a fly which had not fed on blood. 



Figs. 53 — 60, Trypanosoma tullochii. Fig. 53, small form, with minute circular 

 blepharoplast and small vacuole. Fig. 54, larger form of a similar type. Fig. 55, 

 small form showing the flagellum arising from a small granule of chromatin close 

 to the blepharoplast. Fig. 56, large form. Figs. 57 and 58, large forms of trypanosome 

 found in the proventriculus of an infected fly. Fig. 59, dividing form, common type. 

 Fig. 60, dividing form, rare type showing division into three. Figs. 53 — 60 are all 

 from the same fly. Figs. 57 and 58 are from the proventriculus, while the remainder 

 are from the gut of the fly (Olossina palpalis). 



