100 H. M. WOODCOCK. 



PLATE 6. 



Coujugation and spore-formation. (All figs, except fig. 62 relate to 

 C. irregularis.) 



Fig. 57. — The isogametes (primary sporoblasts) and stages in their con- 

 jugation. From a crushed preparation. Flemming, para-carmine. X 600. 



Fig. 58. — Fusion of the sexual nuclei in the zygote ; condensation of the 

 definitive nucleus and change of shape of tlie copula. From sections. Corr. 

 subl. + acetic, para-carmine. X 600. 



Fig. 59. — a,b. Formation of outer cyst-membrane (exospore); d-j. first 

 division of zygotc-nucleus. a, b. Whole from crushed preparations ; corr. subl. 

 -f acetic, para-carm,; c-j. from sections (spore seen obliquely), corr. subl. + 

 acetic, iron-hsem. + orange. X 600. 



(The remaining figs, are from sections.) 



Fig. 60. — Spores with two nuclei; in b only one is entirely in plane of 

 section. Corr. subl. -|- acetic, iron-hsem. + orange. X 600. 



Fig. 61. — Fully formed spores with four nuclei, {c. Cup or plug, closing 

 mouth of inner funnel.) Corr. subl. -f- acetic, iron-hfem. -f- orange. 

 X 850. 



Fig. 62. — {a) Ripe spores of 0. minchinii, with eight sporozoites. 

 (J) Two sporozoites. Corr. subl. -{■ acetic, iron-haem. + orange. X 850. 



Fig. 63. — («) Degenerating primary sporoblasts ; {b) degenerating copulae; 

 (c) polygamous copula. Flemming, para-carm. x 600. 



Fig. 64. — Polynuclear masses from sporulating cysts, (a) About time of 

 conjuiration ; {b) during spore-formation. Corr. subl. -|- acetic, iron-hajm, 

 + orange. X 600. 



