LIST OF ILLUSTRATIONS 



FIG. 



68. 

 69. 



70. 



7 1 - 



7^- 

 73- 

 74- 



75- 

 76. 



77- 

 78. 



79- 

 80. 

 Si. 

 82. 

 83- 

 84. 



S5- 

 86. 



87. 



90. 

 91. 



92. 

 93- 

 94- 

 95- 

 96. 



97- 

 98. 



99- 



IOO. 

 IOI. 

 I02. 

 IO3. 



IO4. 

 105. 



Distomum hepaticum, natural size 



Distomum hepaticum, anatomy . 



Distomum hepaticum, development 



Trematodes : Amphistomum and Ilomalogaster 



Structure of a triclad turbellarian 



Planaria polyehroa 



Taenia solium 



Tcenia solium, head magnuied 



Taenia solium, proglottis 



Development of tape-worm 



Cyst of Taenia echinococcus with daughter-cyst and scolices 



Diagram of organs of a Xemertine 



Tetrastemma, structure 



Ascaris lumbricoides .... 



Ascaris lumbricoides, dissection of female 



Diagram of nervous system of Nematoda 



Ascaris lumbricoides, posterior end of male dissected 



Trichina spiralis . 



Starfish, showing tube feet . 



Starfish, vertical section through an arm 



Starfish, diagrammatic sections 



Asterias rubens, digestive system . 



Ambulacral systems of a starfish . 



Anthenea, dorsal surface 



Anthenea, ventral surface 



Ophioglypha lacertosa . 



Strongylocentrotus 



Corona of sea-urchin . 



Apical systems of plates of sea-urchin 



Cucumaria planci 



Antedon ..... 



Metacrinus interruptus 



Brachionus rubens 



Bugula avicularia 



Plumatella ..... 



Pedicellina ..... 



Magellania flavescens . 



Magellania lenticularis, sagittal section 



