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 



Page 



. 284 

 285 

 . 286 



Cohort I. FraylariinecE . 

 Tribe VI. Epithemie^e 

 Genus 35. Epithemia Breb., 1838 



Cystopleura Breb. , 1849. 

 Rhopalodia Otto Muller, 1895. 



Genus 36. Eunotia Ehr., 1837, Char. Em. 



Himantidium Ehr., 1840 frustules united in long bands. 

 Amphicampa Ehr., 1849 valve having its two margins dentate, fur- 

 ther 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. 



Genus 37. Pseudo-Eunotia Grun., 1865 and 1882 



Genus 38. Ceratoneis Ehr., 1840 . . . . 



Genus 39. Actinella Lewis, 1863 



Desmogium Eul. 



Tribe VII. Synedrea; 

 Genus 40. Synedra, 1831, Char. Em. .... 



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. 



Genus 41. 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. Thalassiothrix Cleve & Grun, 1880 



Tribe VIII. Fragilarie^e 



Genus 44. 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 , 



292 



2 93 



2 93 

 294 



298 



35 



35 

 306 



37 

 37 



318 



320 

 321 



322 



3 2 3 



327 

 327 



