VI BULLETIN 140, UNITED STATES NATIONAL MUSEUM 



30. Syngamus trachea. Outline. After Chapin, 1925. 



37. Syngamus trachea. Head, a, Teeth in S-toothed (normal) form; b, front 



view of head ; c, teeth in 9-toothed form. After Chapin, 1925. 



38. Syngamus trachea. Spicules. After Chapin, 1925. 



39. Syngamus trachea. Male bursa. After Chapin, 1925. 



40. Syngamus microspiculum. a, Male and female; b, head end; c, male 



bursa. After Skrjabin, 1910. 



41. Syngamus parvus. Outline of pair. After Chapin, 1925. 



42. Syngamus parvus. Spicules. After Chapin, 1925. 



43. Syngamus parvus. Dorsal portion of male bursa. After Chapin, 1925. 



44. Syngamus gracilis. Male and anterior portion of female. After Chapin, 



1925. 



45. Syngamus gracilis. Male bursa. After Chapin, 1925. 

 40. Syngamus gracilis. Female tail. After Chapin, 1925. 



47. Cyathostoma bronchialis. Head end. o, Side view; b, front view. From 



Chapin. 1925, after Muehlig, 18S4. 



48. Cyathostoma bronchialis. Male bursa. From Chapin, 1925, after Muehlig, 



1884. 



49. Cyathostoma tadornae. Male. From Chapin, 1925, after Chatin, 1874. 



50. Cyathostoma tadornae. Female tail. From Chapin, 1925, after Chatin, 



1874. 



51. Cyathostoma lari. Female; entire worm. After Blanchard, 1849. 



52. Cyathostoma lari. Female ; head end. After Blanchard, 1849. 



53. Cyathostoma lari. Vulva. After Blanchard, 1849. 



54. Cyathostoma- varicgatum. Male bursa. From Chapin, 1925, after Linstow, 



1890. 



55. Cyathostoma rariegatum. Head, a, Front view; b, side view. From 



Chapin, 1925, after Linstow, 1890. 



56. Cyathostoma boularti. Head ; side view. From Chapin, 1925, after Megnin, 



1SS4. 



57. Cyathostoma boularti. Male bursa. From Chapin, 1925. after Megnin, 



1884. 



58. Cyathostoma boularti. Head; front view. From Chapin, 1925, after 



Megnin, 1884. 



59. Cyathostoma americanum. Outline of female and male worms. After 



Chapin, 1925 (a?=extent of uteri). 



60. Cyathostoma americanum. Head, a, Side view, male; b, front view; c, 



side view, female. After Chapin, 1925. 



61. Cyathostoma americanum. Male, a, Bursa; b, gubernaculum. After 



(liapin, 1925. 



62. Cyathostoma americanum. a, Egg; b. vulva; c, tail (female). After 



Chapin, 1925. 



63. Cyathostoma coscorobae. Buccal capsules of female and male. After 



Chapin, 1925. 



64. Cyathostoma coscorobae. Bursa. After Chapin, 1925. 



65. 66, and 67. Heterakis gullinae. 65, tail, lateral view; 60, tail, ventral 



view ; 67, female tail. After Lane, 1917. 

 68. Heterakis alata. Male tail. After Schneider, 1866. 

 69 and 70. Eeterakis arquata. Male tail ; 69, after Schneider, 1866 ; 70, after 



Travassos, 1913. 



71. Heterakis bancrofti. Male tail. After Johnston, 1912. 



72. Heterakis beramporia. Male tail. After Lane, 1914. 



73. Heterakis bosia. a, Male tail and point of right spicule ; ft, left spicule 



from dorsum ; c, right spicule from side. After Lane, 1914. 



