1/4 GRACE MEDES. 



now possess the same form and staining reaction that it has 

 maintained thus far throughout its course. 



The metaphase passes rapidly, and soon the chromosomes, as 

 in the preceding division, come to lie at the extremities of the 

 spindle, which also closely resembles that of the first spermato- 

 cyte. The chromosomes soon become detached from the ends 

 of these fibers and lie free in the cytoplasm. Generally they are 

 aggregated more or less closely in one region, near where the 

 extremity of the spindle fibers lay, but often they become scat- 

 tered irregularly through the central area of the cell. 



And now an occurrence takes place which has not been pre- 

 viously described in Myriapods, nor am I acquainted with the 

 phenomenon in the male cell of any form, although it is a com- 

 mon occurrence in the egg cell. Exception to this statement 

 should perhaps be made regarding somewhat similar conditions 

 reported by Meves in Palndina and Pygffra. In this work Meves 

 ('03) reports a vesicular condition of the chromosomes in the tel- 

 ophase of both spermatocyte mitoses, but this may persist after 

 the nuclear membrane is formed. The conditions in Scntigera are 

 therefore more comparable to those manifested by various ova. 

 There is no immediate formation of a nuclear-membrane, but each 

 separate chromosome, as it disintegrates, becomes enclosed in a 

 membrane of its own, thus forming a structure similar to a nucleus, 

 but containing only a single chromosome (Fig. 25). The diameter 

 of each of these is no greater than twice that of the chromosome 

 itself. During the formation of these vescicles, the chromo- 

 somes become somewhat granular and often lose entirely their 

 typical dumb-bell outline. They assume various arrangements 

 in different cells ; sometimes they lie close together, often they 

 are scattered throughout the central region of the cell. Imme- 

 diately after forming, however, these vesicles begin to fuse with 

 one another, gradually producing large vesicles which contain 

 more chromosomes. There seems to be no definite order of 

 union, for sometimes they join in pairs (Fig. 26) and these grad- 

 ually come together, while at other times several unite, forming 

 a large vesicle around which are clustered smaller ones (Fig. 27). 

 This latter case seems to occur more frequently although the 

 former is often met with. 



