dubia, 412, also 409; PI. 85 

 Dybowskii, 412, also 410; Pis. 83, 84 

 erecta, 412, also 410; PL 85 

 euchlora, 413, also 409; PI. 89 

 Girardiana, 413, also 408; PI. 84 

 granulosa, 413, also 409; PI. 89 

 hexangulata, 413, also 409; PI. 85 



var. repanda, 413; PI. 84 

 hispida, 414, also 409; PI. 83 



var. coronata, 414; PI. 83 



var. crenulatocoUis fa. recta, 414; PI. 83 



var. papillata, 414; PI. 84 



var. punctata, 414; PI. 84 

 horrida, 415, also 408, 409; PI. 84 

 intermedia, 415, also 410; PI. 83 

 Kelloggii, 415, also 409; PI. 83 

 lacustris, 415, also 410; Pis. 83, 85 

 mammillosa, 415, also 410; PI. 85 

 peridiniformis, 415 

 Playfairii, 416, also 409; PI. 85 

 pulchella, 416, also 409; PI. 83 

 pulcherrima, 416, also 410; PI. 83 



var. minor, 416; PI. 83 

 robusta, 416, also 409; PI. 83 

 rotunda, 416, also 409; PI. 83 

 scabra var. longicollis, 417, also 408; PI. 



85 

 similis, 417, also 408; Pis. 84, 85 

 speciosa, 417, also 408; Pi. 84 

 spectabiUs, 417, also 409; PI. 85 

 superba, 417, also 409; PI. 84 



var. duplex, 417; PI. 84 



var. spinosa, 418; PI. 84 



var. Swirenkiana, 418; Pis. 83, 84 

 sydneyensis, 418, also 409; PI. 84 

 triangularis, 418, also 409; PI. 83 

 varians, 418, also 409; PI. 83 

 volvocina, 419, also 409, 414; PI. 83 

 var. compressa, 419; PI. 83 

 var. punctata, 419; PI. 83 



Trachychloron, 354, also 349, 588 



biconicum, 354; PI. 95 



depauperatum, 355, also 354; PI. 95 

 TrentepohUa, 133, also 132, 571, 582, 584 



aurea, 133; PL 67 

 var. polycarpa, 134 



lolithus, 134, also 133; PL 19 

 Trentepohliaceae, 132 

 Treubaria, 241, also 233, 578 



setigerum, 242; PL 51 

 Tribonema, 306, also 19, 105, 218, 365, 

 383, 582, 587 



aequale, 368 



affine, 367; PL 96 



bombycinum, 367; PL 96 

 var. tenue, 367; PL 96 



minus, 368, also 367; PL 96 



utriculosum, 368, also 367; PL 96 



viride, 367 

 Tribonemataceae, 366 

 Tribonematales, 365 

 Trichodesmium, 479, 593 



lacustre. See Oscillatoria lacustris 

 Trochiscia, 238, also 234, 579 



aspera, 239, also 238; PL 53 



granulata, 239, also 238; PL 53 



obtusa, 239, also 238; PL 52 



reticularis, 239, also 238; PL 53 



sporoides, 239 



Zachariasii, 239, also 238; PL 53 

 Tuomeya, 569, also 586 



fluviatilis, 570; PL 132 

 Turtles, 47, 134, 143 

 Tychoplankton, 3. See also Plankton 



Ulothrix, 95, also 94, 98, 582 

 aequalis, 96, also 95; PL 6 

 cylindricum, 96, also 95; PI. 6 

 moniliformis, 102 

 subconstricta, 96, also 95; PL 6 



subtilissima, 96, also 95; PL 6 



tenerrima, 96, also 95; PL 6 



tenuissima, 97, also 95; PL 67 



variabilis, 97, also 95; PL 6 



zonata, 97, also 95; PL 6 

 Ulotrichaceae, 94 

 Ulotrichales, 93, also 66 

 Ulotrichineae, 94 

 Ulvales, 67 

 Ulvella, 583 

 Urococcus, 82 

 Uroglenopsis, 380, also 376, 590 



americana, 380; PL 99 

 Uronema, 98, also 94, 582 



elongatum, 98; PL 5 

 Utricularia, 502, 542, 548 



Vacuolaria virescens, 421 

 Vaucheria, 290, also 289, 585 



aversa, 291; PL 66 



geminata, 292, also 291; PL 68 

 var. depressa, 292 



hamata, 292, also 291 



longipes, 292, also 291; PL 67 



Nicholsii, 293, also 291; PL 67 



ornithocephala, 291 



orthocarpa, 293, also 291; PL 67 



pachyderma, 293, also 291; PL 67 



polysperma, 293, also 291; PL 67 



sessilis, 294, also 291; PL 68 

 fa. clavata, 294; PL 67 



terrestris, 294, also 291; PL 68 

 Vaucheriaceae, 289, also 288 

 Volvocaceae, 73, also 68 

 Volvocales, 67, also 1, 66 

 Volvox, 77, also 15, 73, 74, 572 



aureus, 78; PL 2 



globator, 78; PL 2 



mononae. See Volvox tertius 



tertius, 79, also 78; PL 3 



Water blooms, 7, 17, 44, 376 

 Westella, 237, also 234, 577 



botryoides, 237; PL 53 

 var. major, 237 



linearis, 237; PL 53 

 Wollea, 526, also 510, 594 



saccata, 526; PL 122 



Xanthophyceae, 2, 342 

 Xanthophyll, 421 



Zoochlorella, 235, also 233, 236, 579 



conduetrix, 235; PL 53 



parasitica, 235; PL 53 

 Zooplankton, 24 

 Zygnema, 323, also 23, 296, 327, 329, 581 



carinatum, 324; PL 78 



chalybeospermum, 324, also 323; PL 74 



conspicuum, 324 



cyanosporum, 325, also 324 



decussatum, 325, also 324 



insigne, 325, also 324 



leiospermum, 325, also 324; PL 78 



micropunctatum, 325, also 324; PL 78 



pectinatum, 325, also 324; PL 69 



stellinum, 326, also 324 



sterile, 326, also 323 



synadelphum, 326, also 323; PL 74 

 Zygnemataceae, 295 

 Zygnematales, 294, also 66 

 Zygnemopsis, 326, also 296, 581 



americana, 327 



decussata, 327; PL 74 



desmidioides, 328, also 327; PL 69 



minuta, 328, also 327 



spiralis, 328, also 327; PL 69 



TifFaniana, 328, also 327; PL 74 

 Zygogonium, 329, also 581 



ericetorum, 329; PL 78 



[977] 



