Olive. — Acrasieae. 
PLATE 6. 
Dictyosteliaceae. 
Eig. 40-44. Germination of the spore of Bictyostelium mucoroides. X 1,430. 
Fig. 45-47. Young inyxamoebae of B. mucoroides, showing contractile vacu¬ 
oles. X 1,430. 
Fig. 48. Myxamoeba of B. sphaerocejohalum. X 2,000. 
Fig. 49-53. Young inyxamoebae of B. mucoroides which still retain the oval 
spore shape, and show nuclear granules. X 2,330. 
Fig. 54. A germinating spore of B. mucoroides. X 2,330. 
Fig. 55-56. Spirem stage of primary nuclear division. X 2,330. 
Fig. 57. Nuclear plate stage. X 2,330. 
Fig. 58. Separation of the daughter chromosomes and the beginning of fission 
of the individual. X 2,330. 
Fig. 59-60. Kounded individuals showing the nuclear vacuole and chromo¬ 
somes. X 2,330. 
Fig. 60, a. An individual with nucleus in anaphase stage showing the diminish¬ 
ing nuclear vacuole. X 2,330. 
Fig. 61-62. Myxamoebae of PolysphondyHum pallidum, stained and fixed. 
X 2,150. 
Fig. 63-64. Myxamoebae of Bictyostelium aureum, showing the peculiar nodu¬ 
lose shape. X 1,560. 
Fig. 65. Young myxamoeba of Polysphondylium pallidum, killed and stained. 
X 2,150. 
Fig. 66. A dividing myxamoeba of Polysphondylium pallidum killed and 
stained. X 2,150. 
Fig. 67. A dividing myxamoeba of Bictyostelium mucoroides. X 2,000. 
Fig. 68. Another dividing individual. X 3,500. 
Fig. 69-71. A dividing myxamoeba at intervals of about one half minute. 
X 3,500. 
Fig. 72-76. Myxamoebae of B. mucoroides, killed and stained, showing nuclei. 
X 2,330. 
Fig. 77-79. Myxamoebae of B. mucoroides, showing nuclei. X 1,450. 
Fig. 80. A living myxamoeba of B. mucoroides, with nuclear granules 
enclosed in vacuoles. X 2,330. 
Fig. 81. A pseudoplasmodium of Polysphondylium violaceum at 11:45 a. m. 
X 460. 
Fig. 82. The saihe at 1 : 00 p. m. of the same day. X 460. 
Fig. 83. The same at 4 :30 p. m. of the same day, showing the cells at the base 
of the stalk, surrounded by the mucus left by the pseudoplasmodium. 
At this stage the colony had reached a height of mm. X 460. 
Fig. 84. Myxamoebae of B.purpureuyn when crawling rapidly toward a colony. 
X 1,450. 
Fig. 85. Several myxamoebae in a colony of bacteria in a drop culture. X 650. 
Fig. 86. Myxamoeba of Polysphondylium pallidum in a group of bacteria, show¬ 
ing one ingested individual. X 2,330. 
Fig. 87. Myxamoeba of Bictyostelium piirpureum showing a bacterium adher¬ 
ing to the ectoplasm, x 2,000. 
Fig. 88. Myxamoeba of B. mucoroides stained with Flemming’s triple stain so 
as to sharply differentiate the ingested bacterium. X 2,330. 
