CONTENTS. 



XV. 



Genus 84. 



Sub-Family III. Crypto- Raphidie/e 

 Tribe XIX. Chtetocere.e 

 I. (a) Rhizosoleniece. 

 Rhizosolenia (Ehr. Brightwell) Per. Em. 1892 



Henseniella Schutt, 1893 frustules flexed. 



(b) Dactyliosolencce. 

 .Genus 85. Dactyliosolen (Castr., 1886) Char. Em. Perag., 1892 

 Genus 86. Guinardia H. Perag., 1892 

 Genus 87. Lauderia Cleve, 1873 



Dotonula Schutt, 1893 spines absent on the surface of the disc. 



Genus 87^ Perag alloa Schuti - , 1895. 



(t) Altheyea. 

 Genus 88. Attheya West, i860 



1 1 . Eu- C/iietocerece. 



Genus 89. Ch/Etoceros Ehr. (1844) Char. Em.. 



Chcetoceros Auct. valves with awns not arranged in a circle on the 

 margin of the valves. 



Bacteriastrum Shadb. , i860 valves plane, bearing a circlet of hori- 

 zo ital awns 



Corethron Castr., 1886 valves convex, furnished with a corona of 

 erect spines 



Ditylum Bailey, 1861 

 Syndetoneis Grun., 1888 . 

 Pyrgodiscus Kitton, 1885. 



Dicladia Ehr., 1844 (spore of chcetoceros ?). 

 Thaumatonema Grew, 1863. 



Syringidium Ehr., 1845 



Syndendrium Ehr., 1845 (spore of chcetoceros?). 



Hercotheca Ehr., 1S44 . 

 95. Goniothecium Ehr., 1844 . 



Tribe XX. Melosire^e 



Page 

 . 410 



. 412 



4i3 



416 



4i7 

 418 



419 

 420 

 420 



Genus 96. Pyxilla (Grev., 1864) H.V.H., 1893. 



Pyxilla Grev. apiculus simple. 



Kenttodiscus Pant., 1889 apiculus covered with sm 



spines. 

 Pterotheca Grun., 1883 apiculus laterally alate. 



Genus 97. Ktenodiscus Pant., 1889 . 



Genus 98. Peponia Grev., 1863 



Genus 1,9. Strangulonema Grev., 1865 



Genus 100. Syndetocystis Ralfs, 1864 



Genus 101. Rutilaria (Grev., 1863) Grev., Em., 1866 



Genus 102. Clavularia Grkv., 1865 . . ' 



scattered 



422 



423 

 424 



425 

 426 



427 



427 

 428 



429 



43 



43 

 43 < 

 43 1 

 43 2 

 433 

 433 



