380 MR. BERKELEY ON ALG^E OF HOT-SPRINGS. Appendix B. 



extremely delicate with very long articulations, singularly swollen at 

 the commissures. The Diatomacece are : — 



Odontidium (hiemale). 



— (mesodon). 



— n. sp., same as at Piti on 



Conferva. 



Denticula (obtusa). 



Navieula. 



Cymbella, three species. 



Epithemia. 



Scarcely any one of these except the Navieula is peculiar to the loca- 

 lity. A fragment apparently of some Closterium, the only one which 

 I have met with in the collection, accompanies one of the specimens. 



The hot springs of Momay, (temp. 110°) at 16,000 feet, produce a 

 golden brown Ccenocoleus representing a small form of C. cirrhosus, 

 and a very delicate Sphcsrozyga, 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. turgi- 

 dulum, and with the former a fine species of Epithemia resembling in 

 form, but not in marking, E. Faba, E. {Zebra) a fine Navieula, perhaps 

 the same with N. major and Fragilaria (virescens) .* In mud from one 

 of the Momay springs («), I detected Epithemia (Broomeii n. s.), and 

 two small Navieula, 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 tempe- 

 ratures varying from 80° to 158°, 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° and 112° there is 

 an imperfect Zygnema with very long articulations, and where the 

 green scum passes into brown, there is sometimes an Oscillatoria, or 

 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°, 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. 



* Mr. Thomas Brightwell finds in a portion of the same specimen Epithemia 

 alpestris, Surirella splcndida, S. linearis, Smith, Pinnularia viridis, Smith, Navicida 

 (lanceolata) and Himantidium (arcus). 



