XVIU 



LIST OF ILLUSTKATIONS. 



41. Stage-Forceps, ..... 



48. Aquatic Box, ..... 



49. Zoophyte-Trough, .... 



50. Compressorium, ..... 



51. Dipping-Tubes, ..... 

 62. Forceps, ...... 



53. Section of Adjusting Object-Glass, 



54. Arrangement of Microscope for Transparent Objects, 



55. Ditto Ditto Opaque Objects, 



56. Spring Scissors, ..... 



57. Curved Scissors, 



58. Valentin's Knife, 



59. Section-Instrument, 



60. Lever of Contact, . 



61. Slider-Forceps, . 



62. Spring-Press, 



63. Turn-Table, 



64. Plate-glass Cells, 



65. Tube-Cells, 



66. Built-up Cells, 



67. Palmofflcea macrococca, after Braun, 



68. Protococcus pluvialis, after Cohu, . 



69. Volvox globator, after Ehrenberg, 



70. Development of Volvox, after Williamson, . 



71. Various species of Staurasirum, after Ralfs, 



72. Closterium lunula, after S. G. Osborne, 



73. Development of Pediastrum granulalum, after Braun, 



74. Various forms of Pediastrum, after Ealfs, . 



75. Conjugation of Cosmarium hotryiis, after Ralfs, 



76. Ditto of Closterium, after Ralfs, 

 11 . .Didymoprium Orevillii, a&er 'RsXh, 



78. Portion of Isthmia nervosa, after Smith, 



79. Triceratium favus, after Smith, 



80. Pleurosigma angulatum, after Wenham, 



81. Biddulphia pulchella, ait&T: Wraith, 



82. Conjugation of Epithemia, after Thwaites, . 



83. Conjugation of Auliicoseira, after Thwaites, 



84. Actinocyclus undulatus, after Smith, 



85. Heliopelta, . . . . 



86. Arachnoidiscus Ehrenhergii, after Smith, 



87. Campylodiscus cosiatus, after Smith, 



88. Surirella constricta, after Smith, 



89. Oomphonema geminalum, after Smith, . 



90. Ditto, more highly magnified, after Smith 



91. Liemophora flahellaia, after Smith, 



92. Meridian circulare and BariUaria paradoxa, after Smith, 



93. AcTinanilies longipes, after Smith, 



94. Diatoma vulgare, after Smith, 



95. Grammatophora serpentina, after Smith, 



96. Isthmia nervosa, after Smith, 



97. Meloseira subjiexilis, after Smith, 



98. Meloseira varians, after Smith, 

 91). Mastogloia Smiiliii, after Smith, 



100. Mastogloia lanceolata, after Smith, . 



101. Fossil Diatomacece from Oran, after Ehrenberg, 



102. Fossil Biatomaceoe from Mourne Mountain, after Ehrenberg, 



103. Hcematococcus sanquineiis, after Hassal, 



104. Development of C/ua, after Kiitzing, 



105. Zoospores of TJlva, after Thuret, 



106. Zoospores of Achlya, after linger, . 



107. Cell-multiplication of Conferva, after Mohl, 



