426 PROTOPHVTA 



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

 (Leibl.), Bicldulphia (Gray), Amphora (Ehrb. I, 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.), I-icmophora (Ag.). 



Literature. 



Agardh— 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, i860, p. 25. 



Griinow — Oesterreichische Diatomaceen, 1862. 



Heiberg — Kritisk Oversigt Danske Diatomaceer, 1863. 



Cleve — Svenska och Norska Diatomaceer, 1868. 



\V. Smith — Synopsis of British Diatomaceee, 1872. 



Hamilton L. Smith — Conspectus of the Diatomaceae, Lens, 1 873, p. 63. 



Habirshaw — Catalogue of the Diatomaceee, 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, 1 88 1. 



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



Castracane — Diatoinacea; of the C//a//^;/^<?r Expedition, 1886. 



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

 Schultze, Schmitz, Askenasy, Borzcow, Cox, Schaarschmidt, O. Mviller, Hogel, 

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

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

 Brebisson, Kitton, Leuduger Fortmorel, Pfitzer, Rattray, Van 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. ^o^^ detailed bibliography see Deby 

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



Class XXVII.— Cyanophyceae. 



In the Cyanophyceas 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 



