390 
Herpetomonas jaculum (Leger) 
Fig. 16. Elongating pre-flagellate with round nucleus and curved blepharoplast. Twort. 
Fig. 17. More elongate parasite. Chromidia present in the posterior end of the body. 
Delafield. 
Fig. 18. A division rosette of pre-flagellates. One of these has again divided into two, 
which have not yet acquired flagella. The undivided form has grown a flagellum 
and has elongated posteriorly, being practically in the full flagellate condition. 
Giemsa. 
Figs. 19—36. Illustrate the flagellate stage. 
Fig. 19. Ordinary flagellate. Posterior end somewhat pointed. Large nucleus and 
well-marked blepharoplast present. Blepharoplast slightly inclined to the long axis 
of the parasite. Delafield. 
Fig. 20. Somewhat broad parasite, commonly occurring. Myonemes seen on the body. 
Blepharoplast extending part way across the body. Delafield. 
Fig. 21. Larger form with well-marked myonemes. Vesicular nucleus with a few grains 
of chromatin. Blepharoplast across almost the entire width of body. Vacuole 
present in posterior end. Tliionin. 
Fig. 22. Parasite showing the arrangement of granules in the protoplasm suggestive of 
a cytopharynx. Vesicular nucleus. Basal granule well seen. Giemsa. 
Fig. 23. Herpetomonas with body twisted on itself. Bichly granular protoplasm, thick 
flagellum and basal granule seen. Thionin. 
Fig. 24. Flagellate showing nucleus with large masses of chromatin. Blepharoplast is 
vertical, an uncommon position. Delafield. 
Fig. 25. Very broad parasite, with short flagellum, vesicular nucleus and posterior vacuole. 
Thionin. 
Fig. 26. Small Herpetomonas somewhat tapering at both ends. Giemsa. 
Fig. 27. Form with a very tapering posterior end and oblique blepharoplast. Iron- 
haematoxylin. 
Fig. 28. Parasite showing well-marked posterior vacuole, isolated large chromidia and 
basal granule. Delafield. 
Fig. 29. Flagellate with thick flagellum. Giemsa. 
Fig. 30. Herpetomonas with large nucleus and curved blepharoplast. Thionin. 
Fig. 31. Small Herpetomonas with round nucleus, curved blepharoplast and isolated 
chromidia. Giemsa. 
Fig. 32. Parasite having nucleus with large chromatin granules. Blepharoplast inclined 
to the long axis of the body. Tapering posterior extremity. Delafield. 
Fig. 33. Herpetomonas showing nucleus with distinct chromatin granules, large blepharo¬ 
plast, chromidia in the posterior end, and thick flagellum. Thionin. 
Fig. 34. Specimen showing large chromatin masses in the nucleus, curved blepharoplast, 
basal granule, large, thick, tapering flagellum, vacuole at the posterior end of the 
body and chromidia. Delafield. x 1950. 
Fig. 35. Very narrow Herpetomonas —the product of repeated longitudinal division, but 
showing typical structure. Safranin. 
Fig. 36. Parasite similar to the one shown in Fig. 34, but the blepharoplast is 
oval and the chromatin granules more regularly disposed in the nucleus. Delafield. 
x 1950. 
Figs. 37—44. Stages in the division of flagellates. 
Fig. 37. Early stage of division showing constricted blepharoplast and nucleus and 
precocious division of the root of the flagellum. Delafield. 
Fig. 38. Division form, nucleus and blepharoplast much as in Fig. 37, but with the 
flagellum still more divided. Myonemes showing well on the body. Giemsa. 
