LIST OF ILLUSTRATIONS. IX 



Page. 



61. Suhulura houeti. Posterior extremity of male; lateral view 55 



62-63. Suhulura boticti. 62. Accessory piece in anterior (a) and posterior (h), 



view and the spicule, (c) 63. Posterior extremity of female 56 



64-65. Heteroxynema cucullatum.. '64. Male (a) and female (6). 65. Head (a) 



dorsal view; {h) ventral view 57 



66. Heteroxynema cucullatum. Posterior extremity of male 58 



67. Heteroxynema cucullatum. Anal sucker of male 58 



68. Heteroxynema cucullatum. Vulva region of female, showing position of 



vagina 59 



69. Heteroxynema cucullatum. Eggs 59 



70. Allodapa elongata. Lateral view of optical section of the head 61 



71. Allodapa elongata. Posterior extremity of male, ventral view. («) orifice 



of caudal gland 61 



72. Allodapa elongata. Posterior extremity of female, ventral view, (a) ori- 



fice of caudal gland 62 



73-75. Seuralum tacapense. 73. A fragment of cuticle. 74. Anterior ex- 

 tremity of body. 75. (a) Head viewed from the front; (h) posterior 



extremity of male, ventral view 63 



76. Oxyuris ambigua. Posterior extremity of male 68 



77. Oxyuris amligua. Posterior extremity of male, viewed from the side 69 



78. Oxyuris ambigua. Posterior extremity of female 69 



79. Oxyuris ambigua. A portion of the posterior extremity of the female. .. . 70 



80. Oxyuris evoluta. Mouth viewed from the front. Slightly flattened under 



pressure 71 



81. Oxyuris evoluta. Posterior extremity of male 71 



82. Oxyuris evoluta. Female 73 



83. Oxyuris evoluta. Female genitalia 74 



84. Oxyuris hilgerti. Anterior extremity, lateral view, (c) cephalic gland 75 



85. Oxyuris hilgerti. Posterior extremity of male, ventral view 75 



86. 0.ryuris hilgerti. Female 76 



87-88. Oxyuris hilgerti. 87. Genitalia of immature female; (a) ovarj'-; (?•) 



receptaculum seminalis; (t) musculo-epithelial ovijector; {u) uterus; 

 (v) vagina. 88. Exceptional arrangement of terminal genitalia in 



female 77 



89. Oxyuris hilga'ti. Egg 77 



90. Oxyuris Jlagellum. Female genitalia 78 



91. Oxyuris Jlagellum. Female 79 



92. Oxyuris hamata. Anterior extremity of female 79 



93. OxTjuris obesa. (a) Head viewed from the front; (b) cross section of 



esophagus; (c) cross section of esophagus posterior of {b);{d) cross section 



of esophagus posterior of (c) 80 



94. Oxyuris obesa. Female 81 



95. Oxyuris obvelata. Posterior extremity of male 82 



96. Oxyuris obvelata. Posterior extremity of female, showing fungus growth . . 82 



97. Oxyuris stossichi. Posterior extremity of male 85 



98. Oxyurus stossichi. Female 85 



99. Oxyurus stossichi. Eggs 85 



100. Oxyurus stroma. Head viewed from the front 86 



101. Oxyurus stroma. Posterior extremity of male 86 



102. Oxyurus stroma. Egg 86 



103. Oxyurus tetraptera. Female 87 



104. Oxyurus tetraptera. Anterior extremity 87 



