ZOOLOGY AND BOTANY, MICEOSCOPY^ ETC. 293 



the breaking up of the plasmodium into separate portions, each 

 containing a nucleus, which rounded themselves off and became the 

 mother-cells of the spores. These divided first into two, and then 

 into four portions, each of which became a spore, the four spores from 

 each mother-cell remaining united into a tetrad. Their germination 

 was not observed. 



Tetramyxa probably belongs, like PlasmodiopJiora, to the Myxomy- 

 cetes ; but is distinguished from other genera of this group by the 

 formation of the spores by quadripartition. On the germination of 

 the spores, zoospores are probably produced, which penetrate into 

 the tissue of the host and produce hypertrophy. The tubers are 

 about the size of a pea. 



Coenonia, a new genus of Myxomycetes.* — P. Van Tieghem 

 describes a new genus of Myxomycetes, found on rotting beans, and 

 belonging to the family of Acrasiace9e,f distinguished by their 

 aggregated plasmodium. The chief interest of this organism is in 

 the great differentiation displayed by the fructification, although this 

 fructification is formed of a simple aggregation of cells all alike, and 

 at first free. The very same myxamoebfe may, according to the con- 

 ditions in which they are found, constitute themselves into any part 

 of the fructification, or into spores from which myxamcebae again 

 proceed. 



Journal of Mycology. — An American journal is announced with 

 the above title, to be issued monthly, and edited by J. B. Ellis (New- 

 field, N.J.) and W. A. Kellerman (Manhattan, Kansas). Special 

 attention will be devoted to descriptions of North American fungi. 



Protopliyta. 



Structure of Chromatophores.J — F. Schmitz replies to Klebs's 

 criticisms on his paper on the chromatophores of Alg8e.§ With 

 regard to Euglena, he asserts that Klebs brings forward no fresh 

 observations in opposition to his own that E. viridis has stellate 

 chromatophores. Entering again into the discussion as to the 

 internal structure of the chromatophores and pyrenoids, he admits 

 the possibility of a concentric lamination in certain particular cases 

 named by Klebs, though repeating his opinion that his observation is 

 opposed to it as a general law. 



Systematic Position of Saccharomyces.|| — M. Eeess combats the 

 view advanced by Brefeld ^ that the yeast-fungi are but special con- 



* Bull. Soc. Bot. France, xxxi. (1884) pp. 303-6. 

 t See this Journal, i. (1881) p. 639. 

 t Bot. Ztg., xlii. (1884) pp. 809-17, 830-41. 

 § See this Journal, ante, p. 109. 



II SB. Phys.-med. Soc. Erlangen, May 12, 1884. See Biol. Centralbl., iv. 

 (1884) pp. 481-3. 



1 See this Journal, iii. (1883) p. 877. 



