Fig. 
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V2z2 
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oF) 
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Spiked Water-milfoil, Myriophy//um spicatum 
Author’s original, from nature 
Parrot’s Feather, Myriophy/lum proserpinacoides 
Author’s original, from nature 
Common Mermaid-weed, Proserpinaca palustris 
Author’s original, from nature 
Marsh Purslain, Ludwigia palustris 
Author’s original, from nature 
Cylindric-fruited Ludwigia, Ludwigia glandulosa 
Author’s original, from nature 
Mulertt’s Ludwigia, Ludwigia mulerttii 
Author’s original, from nature 
Characea. ‘The more abundant forms of Nitella and Chara 
Author’s original, from nature 
Slender Nitella, Nite//a gracilis 
Author’s original, from nature 
Ditchmoss or Anacharis, Avacharis canadensis 
Author’s original, from nature 
Giant Anacharis, Anacharis canadensis gigantea, Hort. 
Author’s original, from nature 
Hornwort, Ceratophyllum demersum 
Author’s original, from nature 
Mare’s Tail or Bottle Brush, Hippuris vulgaris 
Author’s original, from nature 
Willowmoss, Fontinalis antipyratica and F. gracilis 
Author’s original, from nature 
Curled-leaved Pondweed, Potamogeton crispus; and Spear-leaved’Potamogeton, 
P. lanceolata ae 
Author’s original, from nature 
Floating Pondweed, P. vatans; and Broad-leaved Pondweed, P. densus 
Author’s original, from nature 
Spring Water-starwort, Ca//atriche verna 
Author’s original, from nature 
Greater Bladderwort, Utricularia vulgaris; and Lesser Bladderwort, U. minor 
Author’s original, from nature 
Two-flowered Bladderwort, U. 4iflora 
Author’s original, from nature 
Duckweeds, Lemna and Spirodela 
Author’s original, from nature 
Floating Pondmoss, Azo//a caroliniana 
Author’s original, from nature 
Crystalwort, Riccia fluitans 
Author’s original, from nature 
Salvinia, Sa/vinia natans and S. brasiliensis 
Author’s original, from nature 
Trianea bogotensis RA 
Author’s original, from nature 
Frog-bit, Hydrocharia morsus-rane 
Author’s original, from nature 
Madagascar Lace-plant, Ouvirandra finestralis 
After Dreer 
Outline of a Freshwater snail 
Outline of a Freshwater mussel 
Neritina reclivata . . . . . Author’s original, from life . 
Neritina showalteri . . . . ce “< GG * WGC 
Vivipurus UVIVIpUr us ot Ae 6“ “ec “cc “e 
Vivipurus georgianus. . . . «« ee cc 
Campeloma decisum . . . . “ ce coe 
Campeloma ponderosa. . . . “< “< ca (cc 
Liplex subrarinata\ v4, "6 “ se fee 
eM) 
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