316 GENERAL SYSTEMATIC BACTERIOLOGY 



universales nuUae." Two genera are included: Chlamydatomus Tre- 

 visan and Gaffhya Trevisan. 



Gaillonella. A genus of algae named by Bory de St. Vincent (1823, 

 p. 393). Enlows states: 



Gaillonella: Bory de St. Vincent, 1823. Diet, classique d'Hist. Nat., v. 4, 

 1823, p. 393. See also idem, v. 7, 1825, p. 101. Simple cylindrical filaments^ 

 articulated, each section including two capsulary corpuscles, spheroidal, trans- 

 parent, even when filled with ferruginous coloring matter, and divided into two 

 equal parts by a "dissepiment" which appears as a line. "Nous n'hesitons pas 

 k regarder les Gaillonelles comme de simples veg^taux." 



Type species (original designation). — Conferva moniliformis Miiller. Places 

 C. nummuloides here also. 



No species were described in 1823. 



In 1824 Agardh created the genus Meloseira with 5 species. The 

 following year (1825) Bory included two of these species in his genus 

 Gaillonella. Ehrenberg (1833, p. 294) gives the following synonymy 

 and description: 



Gaillonella Bory de St. Vincent 1823, Meloseira Agardh 1824, Gallionelle. 

 Familie der Stabthierchen, Bacillaria. Character generis: Polygastricum, anen- 

 terum, Gymnicum, P seudopodiumf , loricatum. Lorica subglobosa aut ohlonga 

 hivalvis divisione, spontanea intra vaginam deciduam peragenda catenformis, 

 filiformis. 



He described Gaillonella lineata Bory. In 1835 Ehrenberg included 

 in the genus an organism which he termed ^'Gaillonella ferruginea," 

 and which he believed might be the same as the Hygrocrocis ochracea 

 of the botanists. In the following year (1836, p. 217) Ehrenberg dis- 

 cussed this organism at greater length including it with several of the 

 species of diatoms of the same genus. He terms it the "Eisenocker- 

 thierchen," and notes finding its "shell" in many places as a fossil. 

 His figure shows his conception of the organism to be a very minute 

 diatom in chains. 



In his later monumental publication on the infusoria (1838, p. 166) 

 the name was changed to the form Gallionella, a form which has been 

 commonly accepted. The generic diagnosis is given as follows: 



Gallionella. Gaillonelle. Character Animal e familia Bacillariorum, liberum 

 lorica simplici, bivalvi (silicea); cylindricium globosum aut disciforme, spon- 

 tanea imperfecta divisione cateniforme. 



Seven hving and three fossil species are described. Three of these 

 had been previously Hsted as species of the genus Meloseira by Agardh. 



