LIST OF ILLUSTRATIONS. 



FIG. 

 27. 

 28. 



29. 



3°- 



31- 

 32- 

 33- 



34 

 35- 



36- 



37- 

 38. 

 39- 

 40. 

 41. 

 42. 

 43- 

 44- 

 45- 

 46. 



47- 



49. 

 50. 

 51- 



52. 

 53- 

 54. 

 55. 



56. 

 57- 



59. 



Polystomella. (Schultze), .... 



A pelagic Forarainifer — Hastigeritia ( Globigerind) Alurray 



(Brady), ...... 



Optical section of a Radiolarian (Actinomma). (H.'ECKEl. 

 A colonial flagellate infusorian — Proterospongia Hackeli 



(Saville Kent), .... 



Simple sponge — Ascetta pritnordialis. (H/ECKEL), 

 Section of a sponge. (F. E. Schulze), 

 Diagram showing types of canal system of spongi 



(KoRSCHELT and Heider), 

 VlzvAo^ra^rA oi Sycaiidraraphanus. (F. E. ScHULZE), 

 Diagrammatic representation of development of Oscarella 



lobularis. (Heider), .... 

 A. Young Dicyema. B. Female Orthonectid (Rhopalur 



Giardii]. (Whitman and Julin), , 



Salinella. (Frenzel), .... 



Diagram of Ccelenterate structure, . 

 Hydra, hanging from water- weed. (Greene), 

 Minute structure oi Hydra. (Parker and Jickeli), 

 Development of Hydra. (Brauer), 

 Surface view of ^zir^/M. (Romanes), 

 Vertical section of ^«7Wz'a. (Claus), 

 Diagram of life history of .J «;•«//«. (Haxkel), 

 Lucernaria. (Korotneff), 

 Structure of sea anemone. (Andres), 

 Section through sea anemone. (Andres), . 

 Diagrammatic sections of Zoantharian and Alcyonarian 



(Chun), ...... 



Diagram of a Gymnoblastic Hydromedusa. (Allman), 

 Diagrammatic figure of a simple Turbellarian, 

 Diagrammatic expression of part of the structure of a simpk 



Turbellarian, ..... 



Structure of liver fluke. (Sommer), 

 Reproductive organs of liver fluke. (Sommer), 

 Life-history of liver fluke. (Thomas), 

 Diagram of reproductive organs in Cestode joint 



(Leuckart), ..... 

 Life history of Tania solium. (Leuckart), 

 Transverse section of the Nemertean Drepanophorus latus. 



(Burger), ..... 



Transverse section of a Nemertean (Carinella). (Burger 

 Diagram of structure of a Nematode (Oxyiiris). (Galeb). 



