H. Taxon: 12 



Captions for Illustrations 



Plate 1, Shapes of cysts of Hete roder a species. Fig. 1. 



H. rostochiensis . Fig. 2. H. punctata . Fig. 3. 



H. sc hachtii . Fig. U. H. avenae . Fig. S, H. weiss i, 



Plate II. Cyst patterns of Heterodera s chachtii and related 



species. Figs. 7 and (5. Zig-zag line pattern near 

 middle of cysts of H. tr ifol ii and H. schachtii 

 respectively. Fig. 9. Pattera at junction of neck and 

 body of cysts of H. schachtii . Fig. 10. Pattern near 

 vulva of cyst of H. gottinglana. l^lg. 11. Sheaf- 

 shaped object and dark bodies at lower end of cyst 

 of H. schachtii . Fig. 12, Network pattern, a 

 variation of that sho\m in Figs. 7 and 8. L'agnifi- 

 cation of figure 11 is about 200Z, all other about 

 UlOX. 



Plate III. Cyst markings of Het erodera weis_s_i and H. c acti . 



Fig. 13. Lower part of cyst of K. cacti . Fig. II4.. 

 Pattern near middle of cyst of H. weissi. Fig. 15. 

 Pattern at junction of body and neck of H. weissi. 

 Fig. 16. Pattern near middle of cysts of H. cacti . 

 Fig. 17. Lower end of cysts of H. cacti shovjing 

 anus. Fig. 18. Grainy appearance of cyst of H. 

 cacti . All about UlOX. 



Plate 17. Cyst patterns and punctation of Heterodera rostochiensis 

 and H. punctata . Fig. 19. Pattern at vulva and anus 

 of H. rostochi ensis . Fig. 20. Same as Fig. 19 j but 

 with deeper focus to show punctation. Fig. 21. Anal 

 and vulvar openings of cyst of H. Punctata,. (Cyst 

 split in process of preparation"). Fig. 22. Pattern 

 at about middle of cyst of H. rostochi ensis . Fig. 23. 

 Pattern of upper part of cyst of H. punctata, fig. 2\\, 

 Punctation of H. rostochiensis . All about HlOX. 



Plate V, Cysts and eggs of Het erodera species. Fig. 25. 



Punctation of cyst of H. avenae. Fig. 26. Puncta- 

 tion and pattern of cyst o?"H. humuli. Fig. 27. 

 Punctation of cyst of H. trifolii." I'ig. 28. Puncta- 

 tion of egg shell of hT cacti." 



