26 
BULLETIN OF THE BUREAU OF FISHERIES 
EXPLANATION OF FIGURES 
Fig. 1. — View of a typical flagellate. X3150. 
Fig. 2. — Similar to Figure 1, but more strongly decolorized. X3150. 
Fig. 3. — Flagellate with anterior end restricted, causing flattening of nuclei along the side. X3150. 
Fig. 4. — Flagellate viewed at a different angle from Figures 1 to 3 to show attachment of anterior 
flagella. Very strongly decolorized. X3150. 
Fig. 5. — Flagellate viewed at right angles to Figures 1 to 3. Only one nucleus is shown, the 
other lying directly underneath. X3150. 
Fig. 6. — View of flagellate from anterior end to show origin of flagella. X3150. 
Fig. 7. — View of flagellate from posterior end. Note openings of small funnel-shaped organs. 
X3150. 
Fig. 8. — Flagellate with anterior end abnormally retracted. Note the deeply staining envelope 
around the base of the flagella. X3150. 
Figs. 9 to 14. — Successive stages in the division of the flagellates. Figure 9, prophase; 10, meta- 
phase; 11, anaphase; 12 to 14, telophase. X3150. 
Fig. 15. — Early stage of cyst in which the nuclei are preparing for division. X2400. 
Fig. 16. — Slightly later stage of cyst. Nuclei beginning to divide. X240Q. 
Figs. 17 and 18. — Cysts at a somewhat later stage with two pairs of nuclei. X2400. 
Figs. 19 and 20. — Cysts at a still later stage of development with contents divided into two dis- 
tinct individuals. X2400. 
Fig. 21. — Epithelial cell from csecum of trout containing early stage of intracellular parasite. 
X 1640. 
Fig. 22. — Portion of an epithelial cell containing parasite at about same stage as Figure 21. 
X2400. 
Fig. 23. — -Epithelial cell containing early stage of parasite. X 1640. 
Fig. 24. — Intracellular parasite at about same stage as Figure 23, but more highly magnified. 
X2400. 
Fig. 25. — -Slightly later stage than Figure 24. X2400. 
Figs. 26 to 28. — Epithelial cells containing successively later stages of the parasite. X1640. 
Fig. 29. — Intracellular parasite showing tendency of the chromatin to collect in large masses on 
the nuclear wall. X2400. 
Fig. 30. — -Fully grown intracellular parasite or schizont. X2400. 
Figs. 31 and 32. — Slightly later stages of schizont just before division. X2400. 
Figs. 33 to 36. — Successive stages in the first division of the schizont. X2400. 
Figs. 37 to 40. — -Daughter cells formed by division of schizont. In Figures 39 and 40 the nucleus 
of the enveloping cell has a very different structure from that of the inner cell. X2400. 
Fig. 41. — -Epithelial cell containing parasite, which is undergoing schizogony. X1640. 
Fig. 42. — Intracellular parasite at about same stage as Figure 41. Note that nucleus of envelop- 
ing cell shows evidences of disintegration. X2400. 
Fig. 43. — Slightly later stages in schizogony. Enveloping cells disintegrating. X2400. 
Fig. 45. — Somewhat later stage in schizogony. X2400. 
Figs. 46 and 47. — Late stage in schizogony, showing formation of merozoites. X2400. 
Fig. 48. — Epithelial cell containing parasite with chromatin in two masses at opposite sides of 
nucleus. X1640. 
Fig. 49. — Portions of two adjoining epithelial cells containing parasites at a somewhat earlier 
stage than Figure 48. X2400. 
Fig. 50. — Epithelial cell with parasite at a later stage of development than Figure 48. X 1640. 
Figs. 51 to 56. — Series of stages showing transition from the typical intracellular form to the 
flagellate. X2400. 
Fig. 57. — Epithelial cell from the csecum of the fantailed darter (Etheostoma flabellare) , containing 
intracellular stage of Octoinitus sp. X2400. 
