beautifully marked. In some cases, indeed, instead of the ordinary spores, the whole moss is broken up into numerous bodies, as in the fertile joints of _Ulothrix,_ and probably, as in that case, the resultant corpuscles are endowed with active motion. In Silhet, again, is a magnificent _Zygnema,_ allied to _Z. nitidum,_ with large oval spores, about 1/285 part of an inch long, and a dark golden brown colour, and containing a spiral green endochrome. Leaving, however, the lower parts of India, I shall first take the species which occur in Khasia, Sikkim, Eastern Nepal, and the adjoining parts of Tibet. In the hot valleys of the Gtreat Rungeet, at an elevation of about 2000 feet, we have the _Erythronema,_ but under a slightly different form; at Nunklow, at about the same height; in Khasia, again, at twice that elevation; in Eastern Nepal, at 12,000; and, finally, at Momay, reaching up to 16,000 feet. In water, highly impregnated with oxide of iron, at 4000 feet in Sikkim, a _Leptothrix_ occurred in great abundance, coloured with the oxide, exactly as is the case with Algae which grow in iron springs in Europe. At elevations between 5000 and 7000 feet, several European forms occur, consisting of _Ulothrix, Zygnema, Oscillatoria, Lyngbya, Sphaerozyga, Scytonema, Conferva,_ and _Cladophora._ The species may indeed not be identical with European species, but they are all more or less closely allied to well-known Hydrophytes. One very interesting form, however, either belonging to the genus _Zygnema,_ or possibly constituting a distinct genus, occurs in streams at 5000 feet in Sikkim, consisting of highly gelatinous threads of the normal structure of the _Zygnema,_ but forming a reticulated mass. The threads adhere to each other laterally, containing only a single spiral endochrome, and the articulations are very long. Amongst the threads are mixed those of some species of _Tyndaridea._ There is also a curious _Hormosiphon,_ at a height of 7000 feet; forming anastomosing gelatinous masses. A fine new species of _Lyngbya_ extends up as high as 11,000 feet. At 13,000 feet occurs either some simple _Conferva_ or _Zygnema,_ it is doubtful which from the condition of the specimens; and at the same elevation, in the nearly dry bed of the stream which flows from the larger lake at Momay, amongst flat cakes, consisting of felspathic silt from the glaciers above, and the debris of Algae, and abounding in Diatomaceae, some threads of a _Zygnema._ At 17,000 feet, an _Oscillatoria,_ attached or adherent to _Zannichellia_; and, finally, on the bare ground, at 18,000 feet, on the Donkia mountains, an obscure species of _Caenocoleus._ On the surface of the glaciers at Kinchinjhow, on silt, there is a curious _Palmella,_ apparently quite distinct from any European form.