70 



INDEX. 



PAGE 

 CONCHULINA . . .13 



Cory da Dnj. . . 24, 25 



dujardini Gagl. . . 25 



flava Pen. . . 25, 26 



radiata Brown . . 27 



Cryptodifflugia Pen. . 50, 53 



compressa Pen. . 51, 52 



eboracensis Wailes 51, 53 



oviformis Pen. . 50, 51, 52 



sacculus Pen. . 51, 54 



Cucurbitella Pen. . . 47 



mespiliforinis Pen. . 48 



Cyclotella Kuetz. . 18, 20, 21 



operculata Kuetz. . 19 



Cymbella Agardh . 17, 20 



operculata Agardh 18, 20 



Diaphoropodon mobile Arch. . 6 



Difflugia Leidy 4, 6, 47 (syn.), 48 



acuniinata Ehrenb. . 5 



var. curvata Cash . 6 



amphora Ehrenb. . . 39 



amphora Leidy . . 40 



amphora Pen. . . 39 



ainphoralis Hopk. . 40 



cassia Wallich . . 44 



constricta (Ehrenb.) Leidy 



4, 42 (syn.), 43, 44, 46 



var. spinifera Playf. . 42 



corona Wallich . . 6 



labiosa Wailes . . 39 



leidyi Wailes . . 4 



lobostoina Leidy 6, 48 (syn.) 



maiiicata Pen. . . 39 



marsupiformis Wallich 42, 44 



oblonga Ehrenb. . . 5 



var. bryophila Pen. . 37 



var. lacustris Pen. . 37 



var. ienuis Pen. . 36 



olliforniis Lagerh. . 40 



oviformis Cash . . 6 



pyriformis Leidy . . 37 



var. bryophila Pen. . 37 



var. tennis Pen. . 36 



rubeseeus Pen. . 37 



PAGE 



Difflugia subsequalis Pen. 



40 (syn.), 41 

 tuberculata var. minor 



Wailes . .41 



urceolata var. amphora 



Leidy . . 39, 40 



DlFFLUGIN^ . . .36 



Diplochlamys Greeff . 27, 30 



fi-agilis Pen. . 31, 32 



gruberi Pen. . . 31 



leidyi Greeff . . 31 



timida Pen. . 31, 32 



1 vestita Pen. . 31, 33 



Diplophrys timida Brown . 32 



Echinopyxis aculeata (Ehrenb.) 



Carter . . 42 



Euglypha Duj. . 3, 4, 5 



Frustulia Agardh . 17, 20 



(Cyclostella) Kuetz. . 17 



operculata Agardh 18, 20 



Gallionella / (Pyxidicula) 



Ehrenb. . 17, 20 



operculata Ehrenb. . 18 



Heleopera Pen. . 64, 65 



cijclostoma Pen. . . 65 



petricula var. amethystea 



Pen. . . .66 



sordida Pen. . . 63 



sphagni var. lajvis Wailes 64 



Hyalosphenia inconspicua 



West . . .53 



ovalis Wailes . . 55 



papilio Leidy . . 55 



Lecythium mutabile (Bailey) 



Hopk. . . 25 



LOBOSA . . .8 



Microcorycia Cockerell 24, 27 



flava (Greeff) Cuckerell . 25 

 radiata (Brown) Hopk. 25, 27 



Nebela . . . 6, 63 



acolla Cash . .60 



barbata Cash 6, 58 (syn.), 60 

 bigibbosa Pen. . 5, 56 



bipes (Carter) Murray . 5 



