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forms having microtubule counts falling at the lower end of the range, 

 between about 49 and 65. 



Based on descriptions and microtubule number provided by the 

 previously mentioned authors, the parasite in the lower-right hand 

 corner of Figure 4-14, with the large kinetoplast, represents a 

 nectomonad (NM) (78 microtubules). The larger irregular shaped 

 parasite in the center of the electronmicrograph has 125 microtubules 

 and probably represents a haptomonad (HM). The smaller parasite, 

 round in cross section, in the lower- left hand corner of the figure 

 has only 61 microtubules and may represent one of the short-slender, 

 highly active forms (SA). The parasite in the lower- left portion of 

 Figure 4-15 may also be a short-slender, highly active form (SA). 



The descriptions provided by Molyneux _et _aj_. (1975) and Killick- 

 Kendrick (1979) of ultrastructural features within the bodies of the 

 leishmanial parasite are consistent with those seen in L mexicana 

 (strain WR-411). Corrugations in the flagellar sheath were also seen 

 by these authors and tentatively attributed to the method of fixation. 

 The four microtubules associated with the flagellar reservoir (RT) 

 (Fig. 4-14) apparently extend posteriorly through the cytoplasm, past 

 the kinetoplast towards the nucleus. Their relationship to the 

 nucleus is obscure (Molyneux et a_L, 1975). 



Foot-like modifications of the flagellum associated with 

 attachment of Leishmania to the gut wal 1 and stomodeal valve, cal 1 ed 

 hemidesmosomes (HD) (Fig. 4-15), were described by Ki 1 1 ick-Kendrick _et 

 al . (1974). Flagellar adhesion by hemidesmosomes seems to be most 

 efficient when it is to cuticular surfaces. According to Brooker (1971), 

 it enables the parasite to maintain a series of physiologically 



