Conjiigales. See Zygnematales 

 Copper sulphate, 45 

 Crucigenia, 283, also 272, 286, 576 

 apiculata, 283; PI. 65 

 crucifera, 284, also 283; PI. 65 

 fenestrata, 284, also 283; PI. 65 

 irregularis, 284, also 283; PI. 65 

 Lauterbornii, 284, also 283; PI. 65 

 quadrata, 285, also 283, 287; PI. 65 

 rectangularis, 285, also 283, 284; PI. 65 

 tetrapedia, 285, also 283; Pis. 65, 66 

 triangularis, 285 

 truncata, 286, also 283; PI. 66 

 Cryptochrysideae, 441 

 Cryptomonadeae, 441 

 Cryptomonas, 441, also 571, 589 

 erosa, 442, also 441; PI. 95 

 ovata, 442, also 441; PI. 95 

 Cryptophyceae, 440, also 1, 2, 423 

 Cyanarcus, 465, also 445, 591 



hamiformis, 465; PI. 103 

 Cyanophyta, 443, also 1, 2, 486 

 Cylindrocapsa, 109, also 582 

 conferta, 110, also 109; PI. 9 

 geminella, 110, also 109; PI. 9 , 

 var. minor, 110; PI. 9 

 Cylindrocapsaceae, 109 

 Cylindrocapsales, 109, also 66 

 Cylindrospermum, 529, also 510, 594 

 catenatum, 529, also 530; PI. 122 

 Hcheniforme, 529; PI. 131 

 majus, 530, also 529; PI. 122 

 Marchicum, 530, also 529; PI. 122 

 minimum, 530, also 529; PI. 122 

 minutissimum, 531, also 529; PI. 131 

 minutum, .531, also 529 

 muscicola, 531, also 529; PI. 122 

 stagnale, 531, also 529; PI. 122 

 var. angustum, 532; PI. 123 

 Cystodinium, 438, also 264, 589 

 cornifax, 438; PI. 91 

 iners, 439, also 438; PI. 91 

 Steinii, 439, also 438; PI. -93 



Dactylococcopsis, 463, also 252, 445, 591 



acicularis, 464; PI. 105 



fascicularis, 464; PI. 105 



rhaphidioides, 464, also 465; PI. 105 



Smithii, 465, also 464; PI. 105 

 Dactvlococcus, 254, also 234, 575, 576 



infusionum, 255; PI. 56 

 Dasygloea, 59.3 

 Debarya, 296, also 298, 306, 581 



Ackleyana, 297 



glyptosperma, 297 



laevis. See Mougeotia laevis 

 Derepyxis, 374, also 346, 589 



amphora, 375, also 346, 374; PI. 96 



dispar, 375, also 374; PI. 95 

 Desmatractum, 212, also 211, 579 



bipyramidatum, 212; PI. 46 

 Desmidium, 218 

 Desmids, 6, 13, 18 

 Desmokontae, 2, 423 

 Desmonema, 523 

 Diachros, 351, also 349, 587, 588 



simplex, 351; PI. 95 

 Diaphanosoma brachyura, 217 

 Diatoms, 11, 19 

 Dichothrix, 554, also 550, 593 



gypsophila, 555, also 554; PI. 133 

 Hosfordii, 555, also 554; PI. 133 

 Orsiniana, 555, also 554; PI. 133 

 Dichotomosiphon, 289, also 3, 585 



tuberosus, 290; PI. 68 

 Dicranochaete, 131, also 127, 575, 578 



reniformis, 132; PI. 19 

 Dictyosphaerium, 237, also 234, 574 

 Ehrenbergianum, 238; PI. 51 

 pulchellum, 238; PI. 51 



Dimorphococcus, 252, also 234, 574, 577 



lunatus, 252; PI. 55 

 Dinobryon, 376, also 70, 571, 589, 590 

 bavaricum, 377; PI. 98 

 calciformis, 378, also 377; PI. 98 

 cylindricum, 378, also 377; PI. 107 

 divergens, 378, 377; PI. 98 

 sertularia, 378, also 11, 377; PI. 98 



var. protuberans, 379 

 sociale, 379, also 377; PI. 98 



var. americanum, 379 

 stipitatum. See Dinobryon sociale 



var. aflfine. See Dinobryon Vanhoeffenii 

 Tabellariae, 379, also 377; PI. 98 

 Vanhoeffenii, 379, also 377; PI. 107 

 Dinococcaceae, 438 

 Dinococcales, 437, also 425 

 Dinoflagellates, 423; PI. 90 (cysts) 

 Dinophyceae, 423, also 2 

 Dinotrichales, 423, 425 

 Diplocoleon, 532 

 Diplonema, 538, also 533, 595 



rupicola, 538; PI. 126 

 Dispora, 92, also 575 



crucigenioides, 93; PI. 46 

 Distribution, 4, 5, 8, 13, 17, 18, 19, 26, 



29, 30, 43 

 Divisions (Phyla), 2 

 Drainage lakes. See Lakes 

 Drapamaldia, 119, also 87, 113, 584 

 acuta, 120; PI. 15 

 glomerata, 120; PI. 15 

 Judayi, 121, also 120; PI. 16 

 platyzonata, 121, also 120; PI. 15 

 plumosa, 121, also 120; PI. 15 

 Draparnaldiopsis alpina, 121 

 Drepanocladus, 38, 122, 150, 151, 152, 386, 

 440, 477, 503 



Echinosphaerella, 241, also 234, 578 



limnetica, 241; PI. 51 

 Ecology, 4, 8, 11, 38, 48 

 Elakatothrix, 93, also 81, 92, 573, 573 

 gelatinosa, 93; PI. 3 

 viridis, 93; PI. 4 

 Elodea, 531 



Endosphaeraceae, 213, also 210 

 Entocladia, 123, also 114, 583 



polymorpha, 123; PI. 14 

 Entophysalidaceae, 444 

 Eremosphaera, 240, also 234, 579 

 oocystoides, 240; PI. 46 

 viridis, 240; PI. 53 

 Errerella bornhemiensis, 576 

 Erythrotrichaceae, 563 

 Euastropsis, 220, also 219, 572 



Richteri, 220; PI. 47 

 Eucapsis alpina, 450 

 Eudorina, 76, also 74, 572 

 elegans, 76; PI. 1 



illinoisensis. See Pleodorina ilUnoisensis 

 unicocca, 76 

 Euglena, 389, also 19, 212, 388, 408, 571, 

 585, 586 

 acus, 390; PI. 85 



var. rigida, 391; PI. 85 

 convoluta, 391, also 390; PI. 86 

 breviflaeellum. See Euglena convoluta 

 deses, 392, also 390; PI. 85 

 Ehrenbergii, 392, also 390; PL 86 

 elastica, 392, also 390; PI. 86 

 elongata, 392, also 390; PI. 86 

 gracilis, 393, also 390; PI. 85 

 minuta, 393, also 390; PI. 85 

 oxyuris, 393, also 390 



var. minor, 393; PI. 85 

 polymorpha, 393, also 390; PI. 85 

 proxima, 394, also 390; PI. 85 

 sanguinea, 394, also 390; PI. 86 

 Spirogyra, 394, also 390; PI. 86 



[968] 



