424 SUMMARY OF CURRENT RESEARCHES RELATING TO 
globosse, rotundo-quadratae v. subrectangulares, apicem versus filorum 
minores, prope apicem filorum vaginis indistinctis v. destitutis ; pro- 
toplasma pallide aerugineum et liomogeneum. 
The authors make this genus the type of a new family, Campto- 
triche2e : — Ordo novus Homogonearum Homocystearum. Fila brevia, 
vaginata, irregulariter flexuosa, extremitates versus attenuata, serie ir- 
regulari, singula cellularum intra vaginam unamquamque, cellulis baud 
uniformibus, vaginis delicatis et achrois. 
Polychlamydum g. n. Yaginariarum. Plantae aquaticae; fila subbrevia 
(4-6 mm.), flexuosissima et sine ramis ; vaginae amplissimae e serie 
tubarum concentricarum constitutae, tubis interioribus firmissimis et 
coloratis, iis exterioribus hyalinis et plus minusve diffluentibus, apice 
aperto et leviter expanso ; trichomata solitaria, nonnunquam 2 v. 
rarius 3 intra vaginam; apice trichomatis recto; cellulae brevissimae. 
Proterendothrix g.n. Lyngbyearum. Plantae minutae, primum endo- 
phyticae, turn epiphyticae, fila solitaria v. 2-3 associata, brevia et sim- 
plicia ; vaginae achroae, hyalinae et amplae, marginibus irregularibus ; 
trichomata solitaria intra vaginam unamquamque. 
B. Schizomycetes. 
Sulphur Bacteria of the Hot Springs of Yumoto.* — Prof. M. 
Miyoshi found in the hot springs of Yumoto, in Japan, the following 
colourless sulphur bacteria : — Thiothrix nivea , and a new variety thereof, 
Th. nivea var. verticillata , the cells of which are from 2*5-3 y long; 
also Thiothrix tenuis and Beggiatoa alba. 
The following red sulphur bacteria are enumerated : — Chromatium 
Weissii, Chr. minus, Chr. venosum , Chr. minutissimum, and Thioderma 
roseum sp. n. The cells of the latter are spheroidal, 2*5 y long and 
1*5 y broad, are of a pale red colour, and contain minute sulphur 
granules. It forms a thick red-purple scum, and is found on vegetable 
matter at 27° C. 
It would appear that in quick-flowing streams the sulphur is deposited 
in amorphous granules or imperfect crystals, the tufts then being more 
white than yellow. When the current is slow the sulphur is deposited 
usually in longish rhombic octahedra, the tufts then being yellow. In 
the zoogloea-masses there are numberless sickle-shaped bacteria, asso- 
ciated with a greater or less number of other species ; these have been 
already alluded to. Much attention was paid to the chemotactic sensi- 
tiveness of Chr. Weissii , which was found to be attracted by dilute 
solutions of H 2 S, ammonium tartrate and phosphate, and potassium 
nitrate, while stronger solutions of these substances repelled these 
organisms. Chr. Weissii is somewhat sensitive to movement, and then 
often forms closely packed accumulations. 
Iron Bacteria in Hot Springs at Ikao.f — Prof. M. Miyoshi has 
found that the muddy deposit in the chalybeate hot springs of Ikao con- 
sists of the remains or skeletons of iron bacteria, and chemically of iron 
oxide. Microscopically it is distinguished from ferruginous earth by 
the fact that the latter is of a dirty brown hue, is finely granular, 
* Journ. Coll. Sci. Imp. Univ. Japan, x. (1897) pp. 143-73 (1 pi. and 26 figs.). 
f Tom. cit., pp. 139-42. 
