The hot springs of Momay, (temp. 110 degrees) at 16,000 feet, produce a golden brown _Caenocoleus_ representing a small form of _C. cirrhosus,_ and a very delicate _Sphaerozyga,_ an _Anabaina,_ and _Tolypothrix_; and at 17,000 feet, a delicate green _Conferva_ with long even articulations. With the latter is an _Odontidium_ allied to, or identical with _O. turgidulum,_ and with the former a fine species of _Epithemia_ resembling in form, but not in marking, _E. Faba, E. (Zebra)_ a fine _Navicula,_ perhaps the same with _N. major_ and _Fragilaria (virescens)._* [Mr. Thomas Brightwell finds in a portion of the same specimen _Epithemia alpestris, Surirella splendida, S. linearis,_ Smith, _Pinnularia viridis,_ Smith, _Navicula (lanceolata)_ and _Himantidium (arcus)._] In mud from one of the Momay springs (_a_), I detected _Epithemia (Broomeii n.s.),_ and two small _Naviculae,_ and in the spring (_c_) two species of _Epithemia_ somewhat like _E. Faba,_ but different from that mentioned above. The hot springs of Soorujkoond, of the vegetation of which very numerous specimens have been preserved, are extremely poor in species. In the springs themselves and on their banks, at temperatures varying from 80 degrees to 158 degrees, at which point vegetation entirely ceases, a minute _Leptothrix_ abounds everywhere, varying a little in the regularity of the threads in different specimens, but scarcely presenting two species. Between 84 degrees and 112 degrees there is an imperfect _Zygnema_ with very long articulations, and where the green scum passes into brown, there is sometimes an _0scillatoria,_ of a very minute stellate _Scytonema,_ probably in an imperfect state. _Epithemia ocellata_ also contributes often to produce the tint. An _Anabaina_ occurs at a temperature of 125 degrees, but the same species was found also in the stream from the springs where the water had become cold, as was also the case with the _Zygnema._ The Diatomaceae consisted of:-- Epithemia Broomeii, _n. s._ -- thermalis, _n. sp._ Epithemia inaequalis, _n. sp._ Navicula Beharensis, _n. sp._