LIST OF ILLUSTRATIONS 



30. Bones of arm with biceps muscle 



31. Viscera of male frog 



32. Hydra 



^^. Sycon ciliatum 



34. Sycon gelatinosum 



35. Sycon gelatinosum, magnified 



36. Sycon gelatinosum, transverse secti 



37. Ascetta primordialis 

 3S. Section of Spongilla 



39. Skeletun of sponges 



40. Sponge spicules 



41. Obelia colony 



42. Nematocysts of Hydra . 



43. Dissection of Medusa . 



44. Development of Laomedea and Eudend 



45. Structure of Hydra 



46. Petasus and Glossocodon 



47. Bougainvillea ramosa 



48. Physaiia .... 



49. Physaiia arethusa . 



50. Halistemma tergestinum 



51. Aurelia aurita, partly dissected 



52. Aurelia aurita, development . 



53. Tessera princeps . 



54. Tealia crassicornis 



55. Sea-anemone, in sections 



56. Common sea-anemone . 



57. Corallium rubrurn . 



58. Alcyonium palmatum 



59. Tubipora musica . 



60. Pennatula sulcata . 



61. Flabellum curvatum 



62. Astr?ea pallida 



63. Dendrophyllia nigrescens and Madrepora aspera 



64. Cancrisocia on back uf a crab 



65. Hormiphora plumosa 



66. Hormiphora plumosa, section of a tentacle 



67. Idyia roseola ...... 



