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aggregatis in ligno submerso ; cellulis simplicibus, globosis; mem- 
branula gelinea tenui cinctis; cytioplasmate flavo-aurantiaco, homo- 
geneo, nucleo amplo, auranteo-rubro. Cellul. .o0008”—.0001””. 
Not infrequent on boarded sides of basins and old timbers, 
2. Gloeocapsa, Ktz.-—Gl. fenestralis Ktz. Greenhouses.—Gl. 
conglomerata, Ktz. On filaments of old Cladophora, Colorado. 
(T. C. Porter.)—Gl. rupestris, Ktz. Wet rocks, Little Falls, N. J. 
cay A} : 
3. Anacystis, Meneghini. 
A. glauca, n. sp. A. thallo glauco-aerugineo ; strato indetermi- 
nato furidis calcariorum fontium; cellularum familiis oblongis vel 
ovalibus, saepe non distincte limitatis ; tegumentis tenuibus; cellulis 
minimis et numerosissimis, pallide aeruginosis. Cellul. .oc008’”— 
oot”. Fam. .oo5” plus minus. 
4. Gloeothece, Naeg.—GIl. confluens, Naeg. Calcareous springs, 
Newton, Mass. (W. G. Farlow.) —Gl. granosa, Rabenh. Wet 
rocks.—Gl. distans, Stiz. Dripping rocks. : 
5. Leptothrix, Ktz.—L. parasitica, Ktz. On old culms in 
swampy places.—L. ochraceum, Thuret. Small pools.—L. muralis, 
Ktz. Damp walls; common in greenhouses.—L. caespitosa, Ktz. 
Calcareous springs.—L. rigidula, Ktz. Aquariums. 
6. Hypheothrix, Ktz.—H. coriacea, var. Meneghinii, Ktz. Damp 
earth, N. J. (C. F. A.)—H. pallida, Ktz. Forms a reddish-brown 
stratum on dryish ground, N. J. (C. F. A.)—H. turicensis, Naeg. 
Moist rocks. 
HI. bullosa, n. sp.—H., thallo subsphaerico, dilute flavo, flavo- 
albo, gregario; filamentis tenuibus, simplicibus, dense intricatis, 
globis cavis tenacissimis formatis; globis 2-4 lineas diametro; tricho- 
matibus pallide aerugineis, saepius pallescentibus, .co006”, diam. ; 
vaginis achrois, .00016, raro .00024”, 
Shallow sluggish waters, often intermingled with a vagarious 
form of Lyngbia Wollei, Farl. Susquehanna River, Harrisburgh, 
Oct., 1877. : 
H1, Atkenensts, n. sp.—H. filamentis tenacibus, curvatis, densissime 
intricatis, in stratum plus minus expansis, olivaceo-viridibus ; tricho- 
matibus (interne) passim interruptis, saepius moniliformibus 
(praesertim in speciminibus in carbolico acido tempore brevi asser- 
vatis) articulis diametro subequalibus vel duplo longioribus, granu- 
‘latis ; cytioplasmate laete aerugineo; vaginis sat amplis, achrois, 
pellucidis. Diam. cum. vag. .00032”—.00044” ; sine vag. .ooo14”— 
00018", 
Sluggish waters, Aiken, S.C. (H.W. R.) 
7. Beggiatoa, Trevisan.—B. niveum, Rabenh. Sulphur Spring, 
Niagara Falls, 1876. 
B. hinnulea, n. sp.—B. strata colore dilute hinnulea, floccosa, 
caespitosa, fluctuans, 2-3 lineas crassa ; filamentis flexilibus, con- 
tractilibus, evaginatis, indistincte articulatis, 6-9 lineas longis, 
.00005"’-.00007” crassis, hyalinis, subachromatibus, cytioplasmatibus 
obscure granulosis. 
Trenches for warm waste water from steam engines. 
8. Oscillaria, Bosc.—O. violacea, Wallr. Conservatories.—O. 
