LIST Of ILLUSTRATIONS 



FIG. 



68. Distomum hepaticum, natural size 



69. Distomum hepaticum, anatomy . 



70. Distomum hepaticum, development 



71. Trematodes : Amphistomum and Homalogaster 



72. Structure of a triclad turbellarian 



73. Planaria polychroa 



74. Taenia solium 



75. Tienia solium, head magnified 



76. Taenia solium, proglottis 



77. Development of tape-worm 



78. Cyst of Taenia echinococcus with daughter-cyst and scolices 



79. Diagram of organs of a Nemertine 



80. Tetrastemma, structure 



81. Ascaris lumbricoides . 



82. Ascaris lumbricoides, dissection of female 



83. Diagram of nervous system of Nematoda 



84. Ascaris lumbricoides, posterior end of male dissected 



85. Trichina spiralis . 



86. Starfish, showing tube feet . 



87. Starfish, vertical section through an arm 



88. Starfish, diagrammatic sections 



89. Asterias rubens, digestive system 



90. Ambulacral systems of a starfish 



91. Anthenea, dorsal surface 



92. Anthenea, ventral surface . 



93. Ophioglypha lacertosa . 



94. Strongylocentrotus 



95. Corona of sea-urchin . 



96. Apical systems of plates of sea-urchin . 



97. Cucumaria planci 



98. Antedon 



99. Metacrinus interruptus 



100. Brachionus rubens 



101. Bugula avicularia 



102. Plumatella . 



103. Pedicellina . 



104. Magellania flavescens 



105. Magellania lenticularis, sagittal section 



