SOME OBSERVATIONS ON A NEW GEEGARINE. 285 



Fig. 14. — Fir.st division of the sporont nucleus at a somewhat later 

 stage than figs. 12 and 13. Shows polar vesicles more distinct. Also 

 the distinct fibres running down into neighbourhood of original nucleus 

 and karyosome. 



Fig. 15. — First division of sporont nxicleus at a later stage than fig. 14. 

 Vesicles fully formed and fibres running down towards karyosome. 

 The vesicles here sho'svn were 6/t apart, lying respectively at top and 

 l)ottom focus. 



Fig. 16. — Diagram of first spindle just before final separation of first 

 two daughter-nuclei. 



Fig. 17, a, h and c. — Earliest stage of daughter-nuclei, eight or nine 

 in cyst. 



a. Shows centrosomes connected by a thick band, 

 fe. Shows chromatin bunched as an early spindle figure. 

 c. Shows karyosome. 

 All from same cyst. 

 Fig. 18. — Somewhat later daughter-nuclei at end of division. 



a. Shows two centrioles at each pole ; also one daughter- vesicle. 



(The section has not passed through the left vesicle.) 

 h. Shows division of the centriole with poorly developed daughter- 

 vesicle. (The vesicle at the right end of the figure lies outside 

 the plane of this section, and is therefore not seen.) 

 c. Shows a separated daughter-vesicle. 

 All from same cyst. 



PLATE 16. 



[Figs. 21-34 and 36 were fixed with Gilson's fluid and stained with 

 Heidenhains iron-hsematoxylin. Figs. 19 and 20 were stained wifh 

 Delafield's hsematoxylin and eoein. Figs. 19-34 were drawn at 

 magnification of 2000. Fig. 35 is not to scale, being relatively too 

 large.] 



Fig. 19 (a-e). — From same cyst. Somewhat later daughter-nuclei. 

 All show karyosomes. c and d show early stage of spindles, and the 

 karyosomes in a state of activity. 



Fig. 20. — Showing differentiation of ceutrosome into centriole, and 

 centrosphere in a daughter-nucleus of same stage as fig. 19. 



Fig. 21. — Similar daughter-nuclei showing karyosomes : also corre- 

 sponding spindle. 



Figs. 22 and 23. — Later stages of daughter-nuclei, mostly showing 

 karyosomes ; also corresponding spindles. 



VOL. 55, PART 2. NEW SERIES. 19 



