Studies on North American Polystomidae, Aspidogastridae and Paramphistomidae . hru the oral sucker; x 55. 142 PLATE X Fig. Alasscstoma parvum, ventral view; x 27. Fig. 69. A. parvum, cross section thru genital pore;- x 90. Fig. 70. A. parvum, cross saction esophageal bulb; x 70. Fig. A. parvum, cross section thru seminalvesicle; x 70. Fig. 72. A. parvum, cross section posterior to ovary,Showing excretory ducts; x 70. Fig. 73. A. parvum, eross section thru acetabulum;? x 70. PLATE XI Fig. 74. Zygocotyle ceratosa, ventral view; x 1L. Fig. 75. Z. ceratosa, cross section esophageal bulb;

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Studies on North American Polystomidae, Aspidogastridae and Paramphistomidae . hru the oral sucker; x 55. 142 PLATE X Fig. Alasscstoma parvum, ventral view; x 27. Fig. 69. A. parvum, cross section thru genital pore;- x 90. Fig. 70. A. parvum, cross saction esophageal bulb; x 70. Fig. A. parvum, cross section thru seminalvesicle; x 70. Fig. 72. A. parvum, cross section posterior to ovary,Showing excretory ducts; x 70. Fig. 73. A. parvum, eross section thru acetabulum;? x 70. PLATE XI Fig. 74. Zygocotyle ceratosa, ventral view; x 1L. Fig. 75. Z. ceratosa, cross section esophageal bulb; x 45- Fig. 76. Z. ceratosa, cross saction thru origin oforal evaginaticns; x 45. Fig. 77. 7. ceratosa, sagittal section thru anteriorpart of body; x 27. Fig. 78. Z. ceratosa, sagittal section thru the posteriorpart of body; x 27. Fig. 79. Z. ceratosa, sagittal section thru lateralpart of acetabulum. Fig. 80. Z. ceratosa, sagittal section thru genital pore;x 100. Fig. 31. Z. ceratosa, sagittal section thru openings ofLaurers canal and the excretory vesicle; x 90. I. FLJTE II

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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttheses, bookyear1916