38 Synopsis of tJie Bacteria and Yeast Fungi. 



In sulphur springs. 



In Wartmann and Schenk's " Schweiz. Kryptog.," No. 639, this 

 species is published under the name of Symphyothrix nivea, Briigger. 

 Both the names given above are cited as synonyms, but only pro parte. 

 From the label attached I extract the following observations : " Threads 

 inarticulate and motionless, only ^ ro to 7555"' thick (= -5-1 '3 jt), parallel 

 and much entangled, in penicillate tufts, strings, and sheaves of very 

 unequal size, which are surrounded by a common, homogeneous, colour- 

 less gelatine." 



52. B. leptomitiformis (Meneghini), Trevisan ("Flor. 



Eug.," p. 56). 



Oscillaria leptomitiformis, Meneghini. 

 Threads very slender, indistinctly jointed, about i '8-2 -5 /i 

 thick, forming a thin chalk-white slimy layer. (Fig. 29^.) 

 In sulphur springs. 



53. B. arachnoidea (Agardh), Rabenhorst ("Flor. 



Eur. Alg.," ii. p. 94). 

 Oscillaria arachnoidea^ Agardh. 

 O. versatilis, Kiitzing. 



Threads pretty thick, distinctly jointed, strongly motile, 

 with roun ded slightly curved 

 ends. Articulations as long or 

 half as long as broad. Threads 

 5-6-5 /* thick, forming thin, 



Fig. ^.Beggiatoa arachnoidea, x arachnoid, chalk-white gelatinous 



320 (after warming). membranes. (Fig. 31.) 



In sulphur springs and marshes. 



54. B. pellucida, Cohn (Hedwigia, 1865, p. 82). 



Threads about 5 p. thick, motile, distinctly jointed, with 

 rounded ends ; articulati9ns almost as long as broad, trans- 

 lucent, containing but few granules. (Fig. 32.) 



In an aquarium with sea-water. 



