Fig- Page 



115 ^piVeA'V/zteT-mAfaA, Mjriophyllum spicatum 190 



Author's original, from nature 



116 Parrot's Feather, Myriophjllum proserpinacoides . 191 



Author's original, from nature 



117 Common Mermaid-weed, Pronrpinaca paluitris . . 1 9 1 



Author's original, from nature 



118 Marsh Purslain, Ludwigia paluitris ... 192 



Author's original, from nature 



119 Cylindric-fruited Ludwigia, Ludwigia glandulosa . . 193 



Author's original, from nature 



120 Mulertt's Ludwigia, Ludwigia mulerttii 193 



Author's original, from nature 



121 Characea. The more abundant forms of Nitella and Chara 1 94 



Author's original, from nature 



122 Slender Nitella, Nitella gracilis . . 195 



Author's original, from nature 



123 Ditchmoss or Anacharis, Anacharis canadensis ... 196 



Author's original, from nature 



1 24 Giant Anacharis, Anacharis canadensis gigantea, Hort. . 1 97 



Author's original, from nature 



125 Hornwort, Ceratophyllum demersum . . ... . .198 



Author's original, from nature 



126 Mare's Tail or Bottle Brush, Hippuris vulgaris 199 



Author's original, from nature 



127 Willowmoss, Fontinalis antipyratica dLnd. F. gracilis . ... 200 



Author's ori^al, from nature 



128 Curled-leaved Pondweed, Potamogeton crispus; and Spear-leaved Potamogeton, 



P. lanceolata ... . . 201 



Author's orig^l, Irom nature 



129 Floating Pondweed, P. nutans; and Broad-leaved Pondweed, P. densus 202 



Author's original, from nanire 



130 Spring Water-starwort, Callatriche verna . . . Z04 



Author's original, from nanu-e 



131 Greater Bladderwort, Vtricularia vulgaris; and Lesser Bladderwort, V. minor . . 205 



Author's oiiffnz], from nature 



132 Two-flowered Bladderwort, U. biflora ... . . . . zoj 



Author's original, from nature 



133 Duckweeds, Lemna and Spirodela . . . 208 



Author's original, from nature 



1 34 Floating Pondmoss, Azolla caroliniana ■ 209 



Author's original, from namre 

 ■35 Crystalwort, Riccia Jluitans ... . 209 



Author's original, from nature 



136 SzWiraa, Salvinia natans and S. brasiliensis .... zio 



Author's original, from nature 



137 Trianea bogotensis . . 



Author's original, from nature 



138 Frog-bit, Hydrocharia morsus-ranie 



Author's orig^al, from nature 



1 39 Madagascar Lace-plant, Ouvirandra finestralis ... 213 



After Dreer 



140 Outline of a Freshwater snail . ... 217 



141 Outline of a Freshwater mussel ... • ^'9 



142 Neritina reclivata . . Author's original, from life 221 



143 Neritina show alt eri 



144 Vivipurus vivipurus . . 



145 Vivipurus georgianus . . 



146 Campeloma decisum 



1 47 Campeloma ponderosa . ' . 



148 Lioplax subcarinata 



373 



210 



211 



222 

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 223 



223 

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 224 



