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New Protist Parasites 
EXPLANATION OF PLATE XVIII. 
All figures drawn to scale, using Zeiss’ T V' achromatic objective and ocular 4. Fig. 16 
is drawn on a slightly smaller scale than the rest. 
Figs. 1-15 stained with iron haematoxylin, Fig. 16 with Giemsa’s stain. 
(a) Trichomastix trichopterae. 
Fig. 1. Typical individual with long axostyle, clearly connected with basal granules. 
Fig. 2. Individual showing nucleus placed far down the axostyle. 
Fig. 3. Individual with displaced nucleus exposing axostyle from end to end. 
Fig. 4. Withdrawal of axostyle and irregular disposition of nuclear chromatin previous 
to division. 
Figs. 5-10. Stages in longitudinal division. Fig. 10 illustrates the final stage, with the 
daughter individuals hanging end to end. 
Fig. 11. Flagellate with short axostyle, and nucleus showing central karyosome. 
Figs. 12-15. Cysts of Trichomastix trichopterae. 
(b) Spirochaete. 
Fig. 16. Groups of five spirochaetes from hind-gut of trichopterid larva. Fig. 16a shows 
an individual with alternating dark and light transverse bands. Fig. 16c appears to 
be a case of transverse, and Fig. 16d of longitudinal division. 
