Io8 EI SEN. [Vol. XVII. 



Fig. 52. Auxocyte, metaphase. The section is cut at an angle with the cell 

 axis and consequently the upper pole is seen slightly from above, while the lower 

 pole is so viewed that the archosomes are not distinctly seen. The circle of dots 

 around the upper pole are the starting points of the contractile fibers, which are 

 seen to be connected with the somosphere and the centriole by a fine bar of dark- 

 staining plasma. Several accessory archosomes in the cytoplasm. The red spots 

 in the cytoplasm are the scattered remnants of the plasmosphere. The chromo- 

 somes show here and there distinctly the chromioles and the chromomeres. This 

 cell is unusually small for an auxocyte. 



Fig. 53. Auxocyte, metaphase. The chromosomes are regularly placed on 

 the central spindle, all being in about the same stage of development. The spin- 

 dle is halved and presents its inner concave surface to view. Chromioles are 

 seen in all the chromosomes and chromomeres. Most of the chromosomes have 

 commenced to separate. The red blotches are parts of the plasmosphere. The 

 contractile fibers are all well defined, and some of them are seen to connect with 

 the somosphere by a fine bar of darkly staining plasma. At the upper pole is 

 seen one archosome, while at the lower pole there are two. The upper archo- 

 some is connected with the contractile fibers in that part of the section which is 

 not figured here. This archosome is darker and refractive, the two centrosomes 

 being of a dull color and not refractive. The cytoplasm contains no accessory 

 archosomes, but numerous dark-staining granules, which perhaps may be inter- 

 preted as linin granules. Many granules are connected by rings or threads. See 

 also Fig. 51. 



Fig. 54. Auxocyte, metaphase. Most of the chromosomes have separated, 

 and some have begun to contract. The contractile fibers have also contracted ; 

 they are strongly beaded. Chromioles are seen in the chromomeres. The archo- 

 somes are large and distinct. A few accessory archosomes in the cytoplasm. In 

 the central spindle is seen a separated chromatin granule. This figure is a com- 

 posite one as regards the poles. A few chromosomes found in the following sec- 

 tion were added to the lower pole. The accessory archosomes were also added 

 from that section. 



Fig. 55. Auxocyte, anaphase. A stage succeeding that shown in Fig. 54. The 

 chromosomes are drawn much nearer the poles. Chromioles are seen plainly in 

 many places. An archosome at each pole. The contractile fibers are disappear- 

 ing. The plasmosphere is accumulated at the left side of the equator. The 

 central spindle is beginning to dissolve, and shows irregular vacuoles along a line 

 where the coming new cell wall is to appear. A chromatin fragment in the cen- 

 tral spindle. Numerous paraplasmic and linin granules in the equator of the 

 central spindle. 



Fig. 56. Auxocyte, anaphase. The chromosomes are further advanced, 

 approaching the confluent umbrella stage. On account of improper washing out, 

 this figure does not show the details as well as the preceding and following 

 figures. The cell is lengthening out and the central-spindle poles have been 

 pulled down through the chromosomes. A few chromosomes are not yet sepa- 

 rated from each other, but connected by chromoplasm. 



Fig. 57. Auxocyte, anaphase. The chromosomes are entering the confluent 

 umbrella stage. The individual chromomeres are yet distinguishable, but the en- 

 dochromatic granules of the chromoplasts have already come into plain view. 

 The archosomes have diminished in size, now appearing as very faint points. 



