GENERAL SYSTEMATIC BACTERIOLOGY 317 



Included is the species (p. 169) Gallionella ferruginea, "rostfarbende 

 Dosenkette" with the following description: "G. corpusculis tenuissi- 

 mus, utrinque convexis, ovatis, ferrugineis, filis articulatis saepe con-, 

 glumatis, subramosis." with the following synonomy: Conferva ochra- 

 cea Roth? Catal. bot., I, p. 165, Tab. 5, Fig. 2, 1797, Schumacher? 

 Enumeratio plant. Zeelandiae, 1803, II, p. 105, Dillwynne? Synops. 

 of brit. Conferv., 1809, pi. 62. Lyngbya ochracea Leiblein: Flora, 

 bot. Zeit., 1827, p. 260, 280. Oscillatoria ? ochracea Lyngbye ? Tent. 



Hydrophyt. dan., T. 26, C ? Agardh ? Syst. Alg., 



1824, p. 69, incerta species. Gaillonella ferruginea Ehr. Taf . x. dieses 

 Werk., 1835. 



Gaillonella ferruginea Bericht der Berl. Akad. d. Wissensch., 1836, 

 27, Jan., p. 52, 84. 



Why Ehrenberg abandoned the earlier specific ochracea is not 

 evident. 



Ralfs in 1843 (p. 351) described the same organism in the diatom 

 genus Melosira as follows: "Melosira ochracea. Frustules very slender, 

 convex at each end, ovate, not striated, ferrugineous; filaments often 

 connected together in a subramose manner." He gives as synonjons the 

 following: Gallionella ferruginea Ehrenberg, Conferva ochracea Dill. t. 

 62 and Oscillatoria ochracea Grevil. He further states: 



Filaments are so slender and joints so obscure that I have been unable to deter- 

 mine the form of the frustules, and therefore have taken the specific characters 

 from Ehrenberg. Having received from Mr. Dillwyer a specimen of his Conferva 

 ochracea, which I am able confidently to refer to this species, I have restored 

 the original specific name. 



Kiitzing (1849, p. 28) included this organism in his genus Gloeotila, 

 The description given is as follows: 



Gloeotila Kiitzing, Trichoinata eramosa viridia mucosa, ex cellulis monogonimi- 

 cis coviposita. {Paludosae, inundatae). Gl. ferruginea Kg. Phyc. Germ. p. 191. 

 G. ochracea, trichomatibus brevissimis inoniliforinibus, articulis ovato-globosis 

 Diam. 1-2000'". Gallionella ferruginea Ehrenb. Infus., T. 10, f. 7. Melosira 

 minutula Brebiss. Falais. p. 42, pi. 5. In fontibus martialibus (v. v.). Cf. Kg. 

 Bacillac, p. 56. Gallionella ferruginea. 



Griffith (1853, p. 28) pointed out that this organism {Gallionella 

 ferruginea Ehrenb.) is not a diatom, and that it cannot be retained in 

 Kiitzing's genus Gloeotila. He states that the organism consists of 

 two intertwined filaments, and proposed the name Didymohelix. 



According to Molisch, Mettenheimer (1856, p. 139) inclined to the 

 view that Gallionella and Leptothrix are identical. 



