238 Barrett.— Development and Sexuality of Olpidiopsis. 
Fig. 46. An earlier stage of Fig. 45. Nuclei more clearly shown, and appear as mere rings in 
the protoplasm. 
Fig. 47. A segment of a section of a more mature oospore of 0 . vexans. Nuclei more evenly 
distributed throughout the contents and much larger than in earlier stages of the oospore. 
Fig. 48. Nuclei of the oospores of 0 . vexans. a, Nuclei from the section shown in Fig. 47 ; 
b, c, and h, apparently fusing nuclei ; d, e l f 1 and g, nuclei from such a section as shown in Fig. 44. 
Fusion has not yet taken place. 
Figs. 49 and 50. Resting nuclei from a young oogonium. 
Fig. 51. Early prophase. 
Figs. 52 and 53. Conditions resembling synapsis. 
Fig. 54. Apparent segmentation into chromosomes. 
Figs. 55-62, and 66. Nuclei in metaphase stages. In some cases definite chromosomes are 
evident. 
Figs. 63-5. Spindles in the early anaphase. 
Figs. 67-70, 72, and 73. Late anaphase. 
Fig. 71. Telophase. 
PLATE XXVI. 
Fig. 74. An aphid bearing Aphanomyces infected with 0 . luxurians. 
Fig* 75 * An ant pupa on which is growing Saprolegnia ferax infected with 0 . vexans. 
Fig. 76. A very young stage of a sporangium of 0 . luxurians. 
Fig. 77. A young sporangium of 0 . luxurians , showing the large refractive fatty granules. 
Figs. 78-81. Successive stages in the development of 0 . luxurians sporangia. 
Fig. 82. Sporangia showing large vacuoles and developing exit tubes. 
Fig. 83. Early sexual stage of 0 . luxurians. 
Figs. 84 and 85. Later stages of sexual organs, showing large granules and vacuoles. Fig. 85 
shows three antheridia attached to one oogonium. 
Fig. 86. Sexual cells of 0 . luxurians about ready for fertilization to take place. 
Fig. 87. Contents of antheridium partially passed into the oogonium. 0 . luxurians. 
Fig. 88. Two oospores connected by one empty antheridium. 
Fig. 89. Section of a mature oospore of 0 . luxurians stained with iron-alum haematoxylin. 
Fig. 90. Similar section stained with the triple stain. 
