xii LIST OF ILLUSTRATIONS. 



FIG. PAGE 



27. Polystomella. (SCHULTZE), ..... 101 



28. A pelagic Foraminifer Hastigerina ( Globigerina) Murrayi. 



(BRADY), ....... 102 



29. Optical section of a Radiolarian (Actinomma]. (H^CKEL), 103 



30. A colonial flagellate infusorian Proterospongia Hceckelii. 



(SAVILLE KENT), ..... 104 



31. Simple sponge Ascetta primordialis. (ILECKEL), . 117 



32. Section of a sponge. (F. E. SCHULZE), . . 118 



33. Diagram showing types of canal system of sponge. 



(KORSCHELT and HEIDER), . . . .119 



34 Development of Sycandra raphamis. (F. E. SCHULZE), . 123 



35. Diagrammatic representation of development of Oscarella 



lobularis. (HEIDER), ..... 124 



36. A. Young Dicyema. B. Female Orthonectid (Rhopalura 



Giardii}. (WHITMAN and JULIN), , . . 127 



37. Salinella. (FRENZEL), . . . . .128 



38. Diagram of Coelenterate structure, . . . .132 



39. Hydra, hanging from water- weed. (GREENE), . . 134 



40. Minute structure of Hydra. (PARKER and JICKELI), . 137 



41. Development of Hydra. (BRAUER), . . . 139 



42. Surface view of A tirelia. (ROMANES), . . . 144 



43. Vertical section of A urelia. (CLAUS), . . . 145 



44. Diagram of life history of A urelia. (H^CKEL), . . 146 



45. Lucernaria. (KOROTNEFF), .... 148 



46. Structure of sea anemone. (ANDRES), . . .150 



47. Section through sea anemone. (ANDRES), . . . 151 



48. Diagrammatic sections of Zoantharian and Alcyonarian. 



(CHUN), ....... 153 



49. Diagram of a Gymnoblastic Hydromedusa. (ALLMAN), . 156 



50. Diagrammatic figure of a simple Turbellarian, . . 163 



51. Diagrammatic expression of part of the structure of a simple 



Turbellarian, . . . . . .163 



52. Structure of liver fluke. (SOMMER), . . . 165 



53. Reproductive organs of liver fluke. (SOMMER), , . 166 



54. Life-history of liver fluke. (THOMAS), . . .168 



55. Diagram of reproductive organs in Cestode joint. 



(LEUCKART), . . . . . .172 



56. Life history of Tania solium. (LEUCKART), . . 174 



57. Transverse section of the Nemertean Drepanophorus latus. 



(BURGER), ... .177 



58. Transverse section of a Nemertean (Carinella}. (BURGER), 178 



59. Diagram of structure of a Nematode (Oxyziris}. (CALEB), 182 



