Syngamus and Cyathos 
42. Syngamus gracilis n. sp. Bursa of male. 
43. Cyathostoma coscorobae n. sp. Bursa of male. 
44. Syngamus laryngeus Raill. Bursa of male. 
45. Cyathostoma. coscorobae n.sp. Buccal capsule 
of female. 
46. Idem. Buccal capsule of male. 
47. Cyathostoma tadornae Chatin. Posterior ex¬ 
tremity of female. (After Chatin.) 
38. Syngamus gracilis n. sp. Male and anterior 
portion of female. 
39. Syngamus microspiculum Skrj. Bursa of male. 
(After Skrjabin.) 
40. Syngamus gracilis a sp. Posterior extremity 
of female. 
41. Cyathostoma tadornae Chatin. Male, entire 
worm. (After Chatin.) 
