ILLUSTRATIONS. 



PIG. PAGE 



49. Cobmarium margariti- 



ferum 81 



50. Cosmarium Brebissonii 81 



51. Staurastrum punctula- 



tum ; 82 



52. Staurastrum furcigerum 82 



53. Staurastrum gracile. ... 83 



54. Staurastrum macrocefum ' 83 



55. Xanthidium armatum. . 83 



56. Xanthidium antilop.Eeum 83 

 57.' Arthrodesmus incus. . .. 83 



58. Arthrodesmus conver- 



gens 84 



59. Spirotasnia condensata . . 84 



60. Triploceras verticillatum 84 



61. Penium Brebissonii. ... 85 



62. Meridion circulare 91 



63. Diatoma vulgare gl 



64. Bacillaria 92 



65. Fragilaria capucina . . . . 92 



66. Himantidium pectinale 93 



67. Encyonema paradoxum 93 



68. Cocconema lanceolatum 93 



69. Gomphonema acumina- 



tum . ! 94 



70. Epithemia turgida 94 



71. Cocconeis pediculus. . . 94 



72. Eunotia tetraodon 94 



73. Pleurosigma angulatum 95 



74. Surirella splendida 95 



75. Navicula cuspidata. . 96 



76. Pinnularia major 96 



77. Pinnularia viridis 96 



78. Stauroneis phcenocente- 



ron 97 



79. Scenedesmus caudatus. 98 



80. Pediastrum Boryanum . . 98 



82. 



83. 

 84. 



85. 

 86. 



87. 



90. 



91. 

 92. 

 93- 



94. 



95. 

 96. 



97. 



98. 



99. 



100. 



lOI. 



102. 

 103. 

 104. 

 105. 

 106. 

 107. 

 108. 

 109. 

 no. 

 III. 



112. 



PAGE 



Hydrodictyon utricula- 



tum loi 



Batrachospermum mon- 



iliforme 103 



Anabaena 103 



Oscillaria 104 



Spirogyra 105 



Spirogyra in conjuga- 

 tion; with spores. . . . 105 



Zygnema insigne 106 



Vaucheria 106 



Chsetophora elegans... 107 

 Draparnaldia glo'mer- 



ata 108 



Bulbochsete 109 



Amoeba proteus 116 



Vampyrellalateritia.-. . 117 

 Acanthocystis chjeto- 



phora 118 



Actinophrys sol 119 



Actinosphserium Eich- 



hornii 121 



Difflugia pyriformis. . . ii24 



Difflugia corona 124 



Centropyxis aculeata. . 127 



Arcella vulgaris 128 



Arcella dentata 128 



Trinema enchelys. . . . 129 

 Euglypha alveolata... 129 

 Cyphoderia ampulla.. . 130 

 Clathrulina elegans . . . 131 



Dendromonas 149 



Carchesium 150 



Epistylis 151 



Vorticella 152 



Dinobryon 153 



Vaginicola 154 



Platycola 155 



