xii LIST OF ILLUSTRATIONS 



FIG. PAGE 



84. SECTION OF AN AQUARIUM CONSTRUCTED WITH A MIXTURE OF 



CEMENT AND SAND . . . . . 54 



35. CEMENT AQUARIUM WITH A GLASS PLATE IN FRONT . . 55 



36. AQUARIUM OF WOOD WITH GLASS FRONT . . 56 

 87. HEXAGONAL AQUARIUM CONSTRUCTED OF ANGLE ZINC, WITH 



GLASS SIDES ........ 57 



38. METHOD OF AERATING THE WATER OP AN AQUARIUM . 65 



39. AQUARIUM FITTED WITH APPARATUS FOR PERIODIC OUTFLOW . 67 



40. JARS FOR PRESERVING ANATOMICAL AND BIOLOGICAL SPECIMENS . 76 



41. SHOWING THE DIFFERENT STAGES IN THE MAKING OF A SMALL 



SPECIMEN TUBE ....... 77 



42. SMALL SPECIMEN TUBE MOUNTED ON A CARD . . . . 78 



43. SMALL CRAB MOUNTED ON A CARD . . . . .82 



44. SPRING FOR HOLDING TOGETHER SMALL BIVALVE SHELLS . . 84 



45. THE TRIPLET MAGNIFIER . . . . . .92 



46. A SMALL DISSECTING TROUGH . . . . . . 93 



47. CELL FOR SMALL LIVING OBJECTS . . . . .95 



48. SHEET OF CORK ON THIN SHEET LEAD . . . . . 99 



49. WEIGHTED CORK FOR DISSECTING TROUGH . . . .99 



50. THE AM(EBA, HIGHLY MAGNIFIED . . . . . . 102 



51. SHOWING CHANGES OF FOBM .... 103 



52. FEEDING . . . . . . 103 



53. DIVIDING ....... 104 



54. A GROUP OF FORAMINIFERS, MAGNIFIED . . . . 105 



55. A SPIRAL FORAMINIFER SHELL ..... 106 



56. A FORAMINIFER OUT OF ITS SHELL . . . . 106 



57. THE SAME FORAMINIFER (FIG. 56) AS SEEN WHEN ALIVE . . 107 



58. SECTION OF THE SHELL OF A COMPOUND FOHAMINIFER . . 107 



59. SECTION OF A NUMMULITE SHELL ..... 108 



60. Globigerina bulloides, AS SEEN WHEN ALIVE, MAGNIFIED . . 108 



61. SECTION OF A PIECE OF NUMMULITIC LIMESTONE . , . 109 



62. A GROUP OF RADIOLARIAN SHELLS, MAGNIFIED . . . . in 



63. THREE INFUSORIANS, MAGNIFIED . . . . .113 



64. A PHOSPHORESCENT MARINE INFUSORIAN (Noctiluca), MAGNIFIED . 114 



65. SECTION OF A SIMPLE SPONGE ...... 116 



66. DIAGRAMMATIC SECTION OF A PORTION OF A COMPLEX SPONGE . 117 



67. HORNY NETWORK OF A SPONGE, MAGNIFIED .... 118 



68. Grantia compressa . . . . 120 



69. SPICULES OF Grantia, MAGNIFIED ..... 120 



70. Sycon ciliatum ... .... 121 



71. Leucosolenin botryoides, WITH PORTION MAGNIFIED . . . 121 



72. Ohalina oculata ... . . 122 



73. Halichondria panicea . . . . . . . 123 



74. SPICULES OF Halichondria, MAGNIFIED . ... 124 



75. AN OYSTER SHELL, BORED BY Cliona .... 124 



76. SPICULES OF Cliona ....... 125 



