Review of Nematode Genera Syngamus and Cyathostoma 
Plate 3 
21. Cyathostoma americanum n. sp. Side view of 
anterior end of male. 
22. Idem. Front view of head. 
23. Ibidem. Side view of anterior end of female. 
24. Ibidem. Egg from culture (88 days old). 
25. Ibidem. Bursa of male. 
26. Ibidem. Female genitalia in the region of 
vulva. 
27. Ibidem. Side view of tail of female. 
28. Ibidem. Gubernaculum. 
29. Cyathostoma carieyatum (Crep.) Bursa of 
male. (After Linstow.) 
30. Idem. Front view of head. (After Linstow. 
31. Ibidem. Side view of head. (After Lins¬ 
tow.) 
32. Cyathostoma bronchialis (Muehlig). Bursa o 
male. (After Muehlig.) 
33. Idem. Front view of head. (After Muehlig.) 
34. Ibidem. Side view of head. (After Muehlig.) 
35. Cyathostoma botllarti (Mdgnin). Ventral por¬ 
tion of bursa of male. (After Mdgnin.) 
36. Idem. Front view of head. (After Mdgnin.) 
37. Ibidem. Side view of head. (After Mdgnin.) 
