LIST OF ILLUSTRATIONS 



IX 



FIG. 



32. Clisiophyllum Mpartitum, Carboniferous . 



33. Cyclophyllum Jungites, Carboniferous 



34. Sections of Zaphrentis delanouei, Carboniferous 



35. Calceola sandalina, Devonian 



36. Alcyonium digitatum, Recent ..... 



37. Section of polyp of Alcyonium digitatum 



38. Tubipora musica, Recent ...... 



39. Heliopora ccerulea, Recent ..... 



40. Heliolites porosus, Devonian ..... 



41. Section of spine of Echinometra, and plate of Cidaris 



42. Section of arm of Astropecten ..... 



43. Diagram of the water-vascular system of a star-fish 



44. Section of the arm of Ophioglypha .... 



45. Ventral surface of Ophiura. Dorsal surface of Ophioglypha 



46. A, Diagram of a regular echinoid. B, Apical disc of Echinus 



47. Apical discs of Peltastes, Echinocorys, Collyrites, Palceechinus , 



Galerites .......... 



48. Compound Ambulacral Plates. Pseudodiadema. Phymosoma 



49. Spine and Plate of Cidaris florigemma 



50. Under surface of Micraster cor-anguinum, Chalk 



51. Melonechinus multiporus, Carboniferous . 



52. Holaster subglobosus, Chalk .... 



53. Micraster cor-bovis, Chalk .... 



54. Anchor and plate of Synapta. Wheel of Chirodota 



55. Botryocrinus decadactylus, Silurian 



56. Actinocrinus triacontadactylus, Carboniferous. 



57. Cyathocrinus longimanus, Silurian . 



58. Apiocrinus parkinsoni, Bradford Clay 



59. Glyptosphcera and Echinosphcera, Ordovician . 



60. Lepadocrinus quadrifasciatus, Silurian . 



61. Orophocrinus fusiformis, Carboniferous . 



62. Pentremites godoni, Carboniferous . 



63. Ambulacrum of Pentremites .... 



64. Section of Pentremites sulcatus, Carboniferous 



65. Section of ambulacrum of Pentremites 



66. Section of ambulacrum of Codaster . 



67. Section of ambulacrum of Phcenoschisma . 



68. Edrioaster bigsbyi, Ordovician. 



69. Magellania Jlavescens, Recent. Longitudinal section 



70. Terebratula semiglobosa, Chalk 



71. Cyrtia exporrecta, Wenlock Limestone . 



72. Magellania Jlavescens, Recent. Interior of valves 



73. Vertical section of shell of Magellania Jlavescens 



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