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XII. CONTENTS.
Genus 32.
Anorthoneis Grun., 1868, Em. Cleve, 1893
Genus 33. Campvloneis Grun., 1863 .
Genus 34. Cocconeis (Ehr., 1835) Grun., 186S .
Sub-Family II. Pseudo-Raphidie/e
Cohort I. FraylariinecE .
Tribe VI. Epithemie^e
Genus 35. Epithemia Breb., 1838
Genus 36.
Genus 37.
Cystopleura Breb. , 1849.
Rhopalodia Otto Muller, 1895.
Eunotia Ehr., 1837, Char. Em.
Himantidium Ehr., 1840 frustules united in long bands.
Amphicampa Ehr., 1849 valve having its two margins dentate, further
divided by Ehrenberg into :
Ophidocampa Ehr. , 1869 valves with indentations equal
and alternate on the dorsum and venter.
Heterocampa Ehr,, 1869 valves inflated in the middle.
Climacidium Ehr., 1869 Eunotia with girdle face quadrangular,
valves with dorsal margin dentate, truncate, and apices rounded.
Desmogonium Ehr., 1848 Eunotia elongated, apices generally
inflated, arranged in bands or united in a long filament at the
apices.
Pseudo-Eunotia Grun., 1865 and 1882
Genus 38. Ceratoneis Ehr., 1840 .
. . .
Genus 39. Actinella Lewis, 1863
Desmogium Eul.
Em.....
Tribe VII. Synedrea;
Genus 40. Synedra, 1831, Char.
Genus 41.
a. Eusynedra H.V. H., 1865 valves with continuous striae, without
sulci.
b. Ardissonia De Not., 1870 -strise interrupted by sulci.
c. Toxarium Bail. , 1853 valve very narrow, but much enlarged at
the middle and apices ; without strice, but with irregular puncta.
Campylostylus Shadb., 1849
Thalassionema Grun. in Synop., 1863 frustules united in filament or
stellate, valve bordered with coarse beads.
? Pseudo-synedra Leud.-Fort. forms incompletely known: further
examination necessary.
Genus 42. Asterionella Hass., 1850 .
Genus 43.
Genus 44.
Thalassiothrix Cleve & Grun, 1880
Tribe VIII. Fragilarie^e
Fragilaria Lyngbye, 1819, Char. Em.
Grammonema Ag. , 1836 frustules scarcely silicious.
Staurosira Ehr. , 1841 Pseudo-raphe broad, valve often inflated at ihe
middle.
Ralfsia O'Meara, 1875 Valves hyaline.
Genus 45. Cymatosira Grun., 1862 .
Genus 46. Campylosira Grun., 1862 ,
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