PLATE II. 



Fig. 60. Mastogloia Smithii, Thwaites, p. 154. 



Fig. 61. Mastogloia Smithii, Thw., var. lacustris, Grun., p. 154-. 



Fig. 62. Mastogloia lanceolata, Thwaites, p. 154. 



Fig. 63. Mastogloia exigua, Lewis, p. 155. 



Fig. 64. Mastogloia Dansei, Thwaites, p. 155. 



Fig. 65. Mastogloia Grevillei, Wm. Sm., p. 155. 



Fig. 66. Mastogloia Braunii, Grun., p. 156. 



Fig. 67. Navicula nobilis, Ehr., p. 164. 



Fig. 68. Navicula nobilis, Ehr., var. Dactylus, p. 165. 



Fig. 69. Navicula major, Kiitz, p. 165. 



Fig. 70. Navicula viridis, Kiitz, p. 165. 



Fig. 71. Navicula viridis, Kiitz, var. commutata, Grun., p. 165. 



Fig. 72. Navicula cardinalis, Ehr., p. 165. 



Fig. 73. Navicula Trevelyana, Donk., p. 166. 



Fig. 74. Navicula rectangulata, Greg., p. 166. 



Fig. 75. Navicula cruciformis, Donk., p. 166. 



Fig. 76. Navicula lata, Breb., p. 169. 



Fig. 77. Navicula borealis, Ehr., p. 170. 



Fig. 78. Navicula sublinearis, Grun., p. 170. 



Fig. 79. Navicula retusa, Breb., p. 170. 



Fig. 80. Navicula retusa, Breb., var. eubretusa, p. 171. 



Fig. 81. Navicula Hilseana, Janisch, p. 171. 



Fig. 82. Navicula Brebissonii, Kiitz, p. 171. 



Fig. 83. Navicula Brebissonii, Kiitz, var. subproducta, p. 171. 



Fig. 84. Navicula Brebissonii, Kiitz, var. diminuta, p. 171. 



Fig. 85. Navicula stauroptera, Grun., p. 171. 



Fig. 86. Navicula stauroptera, Grun., var. parva, p. 172. 



Fig. 87. Navicula Tabellaria, Ehr., p. 172. 



Fig. 88. Navicula gibba, Kiitz, p. 172. 



Fig. 89. Navicula gibba, Kiitz, var. brevistriata, p. 172. 



Fig. 90. Navicula bicapitata, Lagerstedt, p. 172. 



Fig. 91. Navicula subcapitata, Greg., p. 173. 



Fig. 92. Navicula subcapitata, Greg., var. paucistriata, p. 173. 



Fig. 93. Navicula appendiculata, Kiitz, p. 173. 



Fig. 94. Navicula pdobiceps, Greg., p. 173. 



Fig. 95. Navicula Braunii, Grun., p. 173. 



Fig. 96. Navicula mesolepta, Ehr,, p. 174. 



Fig. 97. Navicula mesolepta, Ehr., var. Termes, p. 174. 



Fig. 98. Navicula Legumen, Ehr., p. 174. 



Fig. 99. Navicula polyonca, Breb., p. 174. 



