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posterior diplosome. Examples of these forms are :— 
1. C. fasciculata (Leger), in the gut of Anophe- 
lines, also in the larvae and pupae. (Crithidia forms are 
very common in the rectum of mosquitoes in the 
tropics.) Two forms occur: (a) small form, 3*5 by 2/4; 
(b) large form, 7 by 3/*. 
2. C. minuta. —In Tabanus tergestinus , shows 
, a 9 and 4 b 9 forms. 
Fig. hi. (1) C. fasciculata ; (2) C. minuta; (3) H. culicis ; 
(4) H. subulata 
3. C. subulata. —In the gut of Tabanidae. 
4. C. campanulata. —In the larva of Chironomus 
flumosus. 
Herpetomonas. —Body spindle-shaped, i.e., tapering 
at both ends, with an ovoid nucleus centrally placed 
and a long sausage-shaped blepharoplast placed 
anteriorly. From this proceed two rod-like rhizoblasts, 
and at the end of these occur two granular points 
(diplosome). From these arise two flagella, which are 
united by a membrane. This double flagellum is not 
