1906] LEWIS—DELOPMENT OF RICCIA 137 
PLATE VI. 
Fic. 34. Spore mother-cell in resting state. Chromatin on a fine linin net- 
Fic. 35. The chromatin is in the form of an irregular thread. 
Fic. 36. Chromosomes formed; weft of delicate fibres about the nucleus. 
Fic. 37. Nucleus elongated and showing a weft of fibres. 
Fic. 38. Spindle with chromosomes in plate. No centrosome. 
Fic. 39. Chromosomes moving to poles of spindle. 
Fic. 40. Chromosomes at the poles, thickening of spindle fibres to form cell 
plate. 
Fic. 41. Daughter nuclei. 
Fic. 42. Cell plate. Daughter nuclei contain numerous spherical bodies of 
chromatin which stain bright red with safranin. 
Fic. 43. Daughter nuclei preparing for division. 
Fic. 44. Daughter nucleus with chromosomes in plate. Neither centro. 
sphere nor centrosome. 
PLATE VIII. 
Fic. 45. Chromosomes moving to poles. 
Fic. 46. Daughter nuclei with chromosomes at the poles to form nuclei of 
spores. The cell plate formed in the first division persists. 
Fic. 47. Second division completed. 
Fics. 48-52. Stages in the division of a sporophyte cell. No centrosome. 
Fig. 48 shows slight radiation of cytoplasm from the poles of the elongated nucleus. 
Fic. 53. Cells of antheridium which show a single rather irregular body near 
the nucleus. 
Fic. 54. Cells of antheridium which shows the distinct centrosome-like 
bodies at the poles of the elongated nuclei. Compare fig. 74. 
Fic. 55. Spindle with centrosome-like bodies at the poles. 
Fic. 56. Centrosome-like bodies present when the chromosomes are almost 
at the poles. 
Fic. 57. Cell from young antheridium. Chromosomes at poles. No 
centrosome can be distinguished. 
Fic. 58. One cell preparing for last division, while the adjoining cel] has the 
spindle formed and arranged diagonally. 
Fic. 59. Diagonal arrangement of spindles in last division of cells in the 
antheridium. 
Fic. 60. Curved spindles. 
Fic. 61. Daughter nuclei formed after diagonal division; centrosome-like 
bodies present. 
Fic. 62. Cells of antheridium after last division. 
Fics. 63-67. Spermatids in mother-cells. 
Fics. 68-73. Stages in the development of the spermatozoids. 
