Page 



scutelloides 91 



Smithii, Breb 92 



trinodis 94 



Nitzschia. 



curvula 89 



linearis /3 89 



Palea 89 



Sigmatella, Greg. . 90 

 Odontella, Ag. 



aurita, Ag 49 



Odontidium 15 



anomalum 16 



Harrisonii 18 



hyemale 15 



mesodon 16 



mutabile 17 



parasiticum 19 



striolalum, Kiitz. . 17 



Tabellaria 17 



Tabellaria, Greg. . 24 



turgidulum, Kiitz. 16 



Orthosira 59 



arenaria 59 



Dickieii 60 



marina 59 



mirabilis 63 



oriehalcea 61 



punctata 62 



spinosa 61 



PlNNULARIA. 



biceps, Greg 96 



borealis 94 



gracillima 95 



Hebridensis, Greg. 94 



hemiptera 95 



integra 96 



interrupta j3 96 



late-striata, Greg. 94 



nodosa 96 



Polyonca 95 



rosirata, Greg. . . 96 



tenuis, Greg 95 



undulata, Greg. . . 95 



INDEX. 



Page 



Pleurosigma. 



Naviculaceum, Breb. 97 



transversale 96 



Podocystis 101 



Americana 101 



Podosira 52 



hormoides 53 



maculata 54 



Montagnei 53 



Rhabdonema .... 32 



Adriaticum 35 



arcuatmn 34 



minutum 35 



Rosarja, Carm. 



globifcra, Carm. . . 53 



SCHIZONEMA 71 



comoides 75 



confertum 75 



cruciger 74 



Dillwynii 77 



divergens 76 



gracillimum 79 



Grevillii 77 



bebnintosum .... 74 



implicatum 78 



implicatum, Harv. 75 



laciniatum 79 



molle 77 



mncosum 75 



obtusnm 78 



parasiticum 79 



prostratum, Grev.. 68 

 quadripunctatum, 



Harv 77 



ramosissimum .... 78 



Smithii 75 



Smithii (3, Harv.. . 7^ 



torquatum 7^ 



Stauroneis. 



constrict a, Ehr. . . 31 



rectangularis, Greg. 91 



Staurosira, Ehr. 



construens, Ehr. . . 17 



107 



Page 



Striatella 36 



arcuata, Ag 35 



tceniteformis, Ralfs 41 

 tceniaformis y, Ralfs 43 



unipunctata 37 



Surirella. 



Amphioxys 88 



apiculata 88 



Crumena 88 



Synedra. 



deformis 98 



fuscidium, Kiitz.. . 89 



investiens 98 



Palea, Kiitz 89 



tenera 98 



undulans, Greg. . . 97 



undulata 97 



Tabellaria 44 



fenestrata 46 



flocculosa 45 



ventricosa, Kiitz.. . 45 



Tessella, Ehr. 



Catena, Ehr 37 



Catena, Ralfs .... 36 



pedicellata,~Duj... 37 



Tetracyclics .... 37 



emarginatus 38 



lacustris 38 



Toxarium, Bail. 



undulatum, Bail. . . 97 



Triceratium. 



armatum 8/ 



exiguum 87 



striolatum 87 



Tryblionella. 



constricta 89 



levidensis 89 



Soleiformis, W. Sm. 89 



Zygoceros, Ehr. 



Mobilensis, Bail. . . 50 



Rhombus, Ehr. . . 49 



Total number of British Species described in the present Work 455. 



PRINTED BY TAYLOR AND FRANCIS, 

 RED LION COURT, FLEET STREET. 



