644 Annals of the South African Museum. 



FIG. 



G-I. First division complete : G, axis approximately tangential to parent (188). 

 x 940. H, axis almost radial, connections and vesicle well defined (185). 

 x 940. I, axis oblique, nuclcoli showing near inner end of cells, particularly 

 in the right (189). x 1000. 



J-N. Later stages in division: J, 4-cellecl (184). x 720. K, 8-celled, show- 

 ing connections and vesicle (194). x 1000. L, optical section of " Bowl" 

 stage (203). x 750. M, surface view of later " Bowl " stage (180). x 720. 

 M, division complete, globoid in side view, phialopore on right (208). x 750. 



PLATE XLIII. 

 V. Rousseldii. Development of sperm globoid, continued. 



Series, living, showing inversion up to " Hat " stage. x 750. 



A, 8.20 p.m. Lip curving inwards (314). 



B, 8.55 p.m. Lip at maximum depression (315). 



C (from another series). Lip straight, pore almost closed (202). In the main series 

 this stage was reached at 10.10 p.m., but movement spoilt the photograph. 



D, 11.20 p.m. Pore beginning to open (318). 



E, 11.50 p.m. Widening of pore continuing (319). 



F, 12.5 a.m. " Thimble " stage, pore wide open (320). 



G, 12.20 a.m. Edges of lip beginning to turn back (321). 

 H, 12.35 a.m. " Hat " stage beginning (322). 



I, 12.45 a.m/j ((323). 



J, 1.0 a.m. -Successive " Hat " stages - (324). 

 K, 1.5 a.m.] [(325). 



PLATE XLIV. 

 V. Roussdetii. Development of sperm globoid, continued. 



Series A-C. Later stages of inversion. x 750. 



A, 12.9 a.m. " Hat " stage well developed (237). 



B, 12.15 a.m. Brim curving over crown (238). 



C, 12.22 a.m. Inversion complete, pore closing and movement about to begin (239). 

 D-F. Stages from a third series. x 750. 



D, 6.27 p.m. Preparation (373). 



E, 1.30 a.m. " Hat " stage seen from above (384). 



F, 2.5 a.m. Inversion nearly complete, pore still wide, line of demarcation between 



colourless ends and chloroplast-containing bases clearly defined. 



G, Mature globoid in surface view (killed, iodine). On the left an undivided male 



initial cell with apex turned inward (21). x 800. 



PLATE XLV. 



V . Roussdetii. Escape of sperm bundles and sperms. 



A. Sperm bundle about to escape ; cilia bunched towards the outside, pushing 



through the outer wall (182). x 720. 



B. Escape further advanced ; some distortion of bundle apparent (183). x 720. 

 C-E. Escape of spermatozoids from globoid. 



