CONTENTS. XI 



I'AUK 



CLASS IV. ECHINODERMS. (Echinoderrnata). . . 127 162 



Systematic Arrangement of Echinoderms. . . . . ' . . 142 162 



Order I. Echinodermata pedicillata (Pediculate Echin.) 142 159 



Fam. I. Crinoidea 142 146 



n. Asteridea 146 149 



in. Echinidea 150 156 



iv. Holothundea 156 159 



Order II. Apoda 159 162 



Fam. V. Synaptince 159 160 



vi. Sipunculacea 160 162 



CLASS V. INTESTINAL WORMS. (Entozoa). . . 163 192 



Systematic Arrangement of the Intestinal Worms 178 192 



Order I. Sterelmintha 178188 



Fam. i. Cestoidea . . . ' 178 184 



n. Acanthocephala 184 



in. Trematoda 184 188 



Order II. CoelelmintJia 188192 



Fam. iv. Nemato'idea 188 192 



Appendix to the Class of Intestinal Worms 193 194 



CLASS VI. WHEEL-ANIMALCULES. (Rotatoria). . 194206 



Systematic Arrangement of Wheel-animalcules ...... 199 206 



Order single. Rotatoria 199 206 



Fam. i. Floscularice 199 200 



n. Melicertina 200 201 



in. Brachioncea 201 202 



iv. Hydatincea 202 205 



,, V. Philodincea 205 206 



CLASS VII. RINGED WORMS. (Annulata). . . 207 246 



Systematic Arrangement of Einged-worms 219 246 



Order I. Turlellaria 219 224 



Fam. I. Planariece 219 223 



II. Nemertini 223 224 



Order II. Suctoria 225 228 



Fam. in. Hirudinea 225 228 



Order III. Setigera 228 



Fam. iv. Lumbricini 228 233 



v. Maldanice 233 234 



vi. Amphitritce 234 237 



vii. Arenicolce ; 237 



