EXPLANATION OF PLATE 3 

 Crithidia leptocoridis sp. nov., flagellate stages 



Fig. 57. Elongate flagellate from the colon. No direct rhizoplast present 

 but a fusion of rhizoplast and "axostyle" from base of flagellum to nuclear 

 membrane. 



Figs. 58 and 58b. Elongate flagellates from colon, vegetative phase. Promi- 

 nent "axostyle" with chromidia present. The attachment of rhizoplast and 

 axostyle the same as in figure 57. In 586 there is an extension of clear area 

 about "kinetonucleus" to the nucleus. 



Fig. 59. An elongate flagellate from colon. Body somewhat wider. Two 

 chromosomes present in posterior end. Chromatin of nucleus stained lightly. 



Figs. 60 and 62. Extremely long, thin flagellates of colon. Three elongate 

 granules present in nucleus. Edge view of body showing the "axostyle" 

 clearly. 



Fig. 61. Another long flagellate of colon, showing a chromidial granule in 

 posterior part of the body. 



Fig. 63. Early longitudinal division stage. The "kinetonucleus" has 

 divided but the nucleus shows no constriction yet. 



Fig. 64. Early longitudinal division stage, "kinetonucleus" already 

 divided with a spindle-like formation within nuclear membrane of the nucleus. 



Fig. 65. Division stage showing splitting of the rhizoplast and "axo- 

 style." A spindle-like structure is present within the nuclear membrane. Five 

 chromosome-like bodies are present, three large and two small ones. 



Figs. 66-68. Division forms, showing some irregular structures in connec- 

 tion with the nuclei. In each there are four large chromosome-like granules. 



Fig. 69. A division form from the colon showing that nucleus has divided 

 before the "kinetonucleus." A chromatin granule is present at the base of 

 the "axostyle" and it is about to divide. The light area in the center indi- 

 cates the plane of division. 



Figs. 70-71. Division forms. Figure 70 shows a granule at the base of 

 the "axostyle" which has divided also. 



Fig. 72. More advanced division form. Cytoplasm dividing longitudinally 

 in a median plane. Chromatin in irregular granules. 



Fig. 73. Advanced division form. "Axostyle" could not be traced pos- 

 terior to the chromatin granule. Chromatin material in the nucleus in irregu- 

 lar masses. 



[20] 



