YAMANOUCHI—POLYSIPHONIA VIOLACEA 449 
Fic. 163a. The nuclei of fig. 163 under higher magnification, showing the 
Tucture with linin network and nucleoli. 
Fic. 164. The four daughter nuclei are completely formed (two visible); 
Sa furrow appearing at the periphery. 
G. 164a. Portion of jig. 164 under higher magnification, showing details 
of oe furrows. 
Fic. 165. T, etraspore mother cell with cleavage furrows growing towards the 
center. 
Fic. 165a. Portion of fig. 165 under higher magnification, showing the vacuolar 
structure and the progress of the cleavage furrows. 
PLATE XXVUI. 
Abnormalities. 
Fic. 166. A young antheridium in which a stalk cell has increased in size and 
umed the appearance of an auxiliary cell in the procarp. 
Fic. 167. Showing the division of a stalk cell; de black spot within the cell 
indicates transverse section of protoplasmic sthende connecting it with other 
Stalk cells above or below 
Fic. 168. A cell ceeed on a sexual plant whose lineage is similar to that 
the tetraspore mother cell. 
Fic. 168a. This cell from fig. 168 under higher magnification; the nucleus in 
a resting condition. 
Fic. 169. Still later stage in the formation of this cell. 
‘IGS. 170a-170g. Seven sections of a similar cell; nucleus remains undivided, 
although the eins of a cleavage furrow is present, which however never 
Fic. 170d’. eden of fig. r7od under higher magnification, in a resting 
condition, 
Fic. 171. A rare’case where the nucleus of this cell undergoes a typical mitosis. 
Fic. 171a, The nucleus of jig. 171 under higher magnification 
Fic. 1714’. The mitotic figure of jig. 171a under still higher a 
Shows that this division is typical and that the daughter chromosomes are 2 
number in each;, . group. 
