ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 405 



The author has completed a Flora of European Cyanophycese, but owing 

 to the war it has not yet been printed. 



Chlorophyceae.* — E. Lemmermann, J. Brunnthaler, and A. Pascher 

 are the authors of the fifth volume of the " Freshwater Alga3 of 

 Germany, Austria, and Switzerland." It contains Tetrasporales, Pro- 

 tococcales, and an account of certain uni-cellular alga3 of uncertain 

 position, Coccomyxa {Botrydina), Olcaotseiiium, Keratococcus, Elakotothrix, 

 NannoMoster, Protococcus, and DaMylothece. Two new species are 

 described. A key by Pascher is given to the cellular, not filamentous, 

 green algas. Notes are given on the possible confusion of certain 

 forms in their determination ; also on the occurrence of the species, 

 whether catharol or saprol. Two of the authors are now dead. 



Animal-like Nutrition among Green Algse.f — A. Pascher records 

 animal-like nutrition among the amoeboid macrospores of Tetraspora, 

 SUgeodonimn, and Draparnahiia. Small Tetraspora amoebfe, with broad 

 stout pseudopodia, and having rather a slow movement, took in and 

 devoured certain Bacteria, Cyanophyce^ and Protococcales. Thick- 

 walled spores were not devoured. These amoebse also assimilated CO2, 

 and were sensitive to light. Macrozoospores of Stigeodonium with 

 amoeboid movement were common, and had the structure of normal 

 macrozoospores. They only difi"er from the swarming macrozoospores 

 through their long period of movement, eight to thirty-six hours. The 

 amoebai divided up much more quickly than the swarm germlings. Similar 

 results were obtained with Tetraspora, though not so quickly. The 

 animal-like feeding in amcebfe of Stigeodonium was very lively. They 

 absorbed Bacillariales, Bacteria, Cyanophycefe, Chlorophycere, and even 

 Desmidiaceffi. Long before germination the foreign body was expelled. 

 In Draparnaldia, amoeboid stages of the microzoosporea were often 

 found, but the animal-like feeding occurred seldom. Chlamydomonads 

 and Scenedesmus were taken, never Cyanophyceffi or Bacillariales. 

 Finally, the author discusses the contractile vacuoles. In swarmers, the 

 two vacuoles are mostly in front, fairly near each other. In the 

 amoebae, especially in the long drawn-out Stigeodonium forms, the space 

 between them may be quite large. The rhythm of pulsation remains 

 the same, however. Sometimes it is possible to divide the long amoebae 

 into two parts. The vacuole in the portion without a nucleus soon 

 stops pulsating, while the vacuole in the nucleus-containing portion 

 pulsates mostly more rapidly. The tempo is slower, however, if the 

 nucleus-containing portion is relatively small. These small nucleus- 

 containing portions grow to normal size and germinate normally. 



Periodicity of Freshwater Algse.J — E. X. Transeau has made a 

 continuous study of the freshwater algae of central Illinois during seven 



* Siisswasserflora Deutschlands, Heft v. Chlorophvcese II. Jena : G. Fischer, 

 1915. See also Bot. Centralbl., cxxxi. (1916) pp. 361-2. 



t Ber. Deutsch. Bot. Gesell., xxxiii. (1915) pp. 427 (1 yl.). See also Bot. Cen- 

 tralbl., cxxxi. (1916) pp. 362-3. 



X Amer. Journ. Bot., iii. (1916) pp. 121-33 (3 figs.). 



