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XIV. CONTENTS.<br />

Genus 68. ....<br />

Page<br />

B. More than two false septa.<br />

a. Fossil or fresh water forms.<br />

Tabellaria Ehr., 1839 356<br />

Genus 69. Tetracyclus (Ralfs, 1843) Grun, 1862<br />

357<br />

359<br />

Salacia Pant., 1889 valves elliptic, lanceolate.<br />

Goniphogramma Braun, 1852 valves elliptic, frustules united by<br />

twos or threes.<br />

....<br />

Genus 70. Stylobiblium Ehr., 1845<br />

....<br />

b. Marine forms.<br />

....<br />

Genus 71. Rhabdonema Ktz., 1844<br />

Genus 72. Climacosira Grun., 1862<br />

Genus 73. Striatella Ag., 1832<br />

Hyalosira Ktz., 1844 septa appearing alternately interrupted at<br />

their apex.<br />

Tessella Ehr., 1838 septa interrupted in the middle of their ....<br />

length.<br />

Genus 74. Lamella Brun., 1894<br />

Cohort III. Surirellineaz....<br />

Tribe XVI. Surirelle^e<br />

Genus 75. Podocystis Ktz., 1844, Char. Em.<br />

Euphyllodium Shadb. , 1853 costas anastomosing.<br />

Genus 76. Hydro-silicon Brun., 1891<br />

Genus 77. Cymatofleura W. Sm., 185 i....<br />

Genus 78. Surirella Turpin, 1827<br />

Stenopterobia Breb. in litt. frustules narrow, elongated, sigmoid.<br />

Genus 79.<br />

Genus 80.<br />

Genus 81.<br />

Calodiscus Rab., 1853 valves orbicular or sub-orbicular, without<br />

median line.<br />

Plagiodiscus Grun. and Eul., 1868 valves reniform, with radiant<br />

costae (anomalous forms).<br />

Campylodiscus Ehr., 1841<br />

Cohort IV. Nitzschiinece .<br />

Tribe XVII. Nitzschieve<br />

Hantzschia Grun., 1877<br />

.<br />

Nitzschia (Hassall, 1845 5 ^ M - Smith) Char. Em.,<br />

Grun., 1880<br />

Bac<strong>ill</strong>aria Gmel. , 1788<br />

. . . .<br />

Tryblionella W. Sm.,<br />

frustules in tablets or in oblique rows.<br />

1853 valves undulate, septate, with carina<br />

indistinctly punctate.<br />

Pritchardia Rab., 1863 carina with puncta prolonged into costas,<br />

striae alternately prolonged.<br />

Perrya Kitton, 1874 carinal dots prolonged into long interrupted<br />

lines.<br />

Grunowia Rab., 1864<br />

costas.<br />

dots prolonged into transverse or dimidiate<br />

Nitzschiella Rab., 1864 valves with apices very attenuated (flexed).<br />

Homoeocladia Ag., 1827 frustules enclosed in mucous tubes.<br />

Genus 82. Gomphonitzschia Grun., i8c8<br />

Tribe XVIII. Cylindrothece^e<br />

Genus 83. Cylindrotheca Rab., 1859<br />

359<br />

360<br />

361<br />

362<br />

3 64<br />

3 6 4<br />

364<br />

365<br />

366<br />

366<br />

.168<br />

375<br />

380<br />

380<br />

380<br />

382<br />

408<br />

409<br />

409

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