426 PROTOPHYTA 



Nitzschia (Hass.), Pleurosigma (W. Sm.), Achnanthes (Bory), Meridion 

 (Leibl.), Biddulphia (Gray), Amphora (Ehrb.), Campylodiscus (Ehrb.), 

 Cymbella (Ag.), Epithemia (Breb.), Pinnularia (Ehrb)., Stauroneis 

 (Ehrb.), Surirella (Turp.)", Synedra (Ehrb.), Mastogloia (Thw.), 

 Amphipleura (Ktz.), Fragillaria (Lyng.), Tabellaria (Ehrb.), Aulacodiscus 

 (Ehrb.), Coscinodiscus (Ehrb.), Licmophora (Ag.). 



LITERATURE. 



Agarclh Conspectus Diatomacearum, 1830. 



Ehrenberg Die Infusionsthierchen, 1838. 



Kiitzing Die kieselschaligen Bacillarien, 1844. 



Rabenhorst Die Slisswasser-Diatomaceen Deutschlands, 1853. 



Rylands (Marking of diatoms) Quart. Journ. Micr. Sc., 1860, p. 25. 



Grunow Oesterreichische Diatomaceen, 1862. 



Heiberg Kritisk Oversigt Danske Diatomaceer, 1863. 



Cleve Svenska och Norska Diatomaceer, 1868. 



W. Smith Synopsis of British Diatomacese, 1872. 



Hamilton L. Smith Conspectus of the Diatomaceae, Lens, 1873, P- 63. 



Habirshaw Catalogue of the Diatomaceae, 1877.. 



Mereschkowsky- (Movements of diatoms) Bot. Zeit., 1880, p. 520. 



Hallier Untersuchungen iiber Diatomeen, 1880. 



Brun Diatomacees des Alpes, 1880. 



Van Heurck Synopsis des Diatomacees de Belgique, 1881. 



Pfitzer Die Bacillariaceen, in Schenk's Handbuch der Botanik, ii., 1882. 



Castracane Diatoihaceae of the Challenger Expedition, 1886. 



Also numerous papers by Wallich, Thwaites, Carter, Liiders, Millardet and Kraus, 

 Schultze, Schmitz, Askenasy, Borzcow, Cox, Schaarschmidt, O. Miiller, Flogel, 

 Schiitt, Nelson and Karop, Deby, Brun, Cleve, Grunow, Janisch, F. W. Lewis, 

 Greville, O'Meara, Petit, Gregory, Donkin, Ralfs, Walker-Arnott, Castracane, 

 Brebisson, Kitton, Leuduger Fortmorel, Pfitzer, Rattray, Yan Heurck, Grove and 

 Sturt, and others. 



For the preparation of diatoms as microscopic objects see H. L. Smith, Lens, 

 1873, p. 209 ; Kitton, Science Gossip, 1877. For detailed bibliography see Deby 

 and Kitton, Bibliography of the Microscope, pt. 3, the Diatomaceae, 1882. 



Class XXVII. Cyanophyceae. 



In the Cyanophyceae or Phycochromaceae are included all those 

 unicellular chlorophyllous organisms in which the cell-sap is uniformly 

 pervaded by a blue-green pigment which masks the pure green of the 

 chlorophyll. This pigment can be separated, giving, in its aqueous 

 solution, a beautiful blue colour in transmitted, a blood-red in reflected 



