ON SOME ALG FROM HOT SPRINGS 247 
46. Surirella ovalis Bréb. Stream from Great Geyser, mean 
- temp. 40° 
Var. minuta (Bréb.) Van Heurck. With the typical form. 
47. Hanteschia et el (hrenb.) Grun. Stream from Great 
Geyser, mean temp. 40° 
48. Nitzschia = esti Grun. Hveravellir, temp. 88° C. 
49. Nitzschia Denticula Grun. Hyeravellir, very abundant at a 
temperature of 24° C. 
50. Nitzschia dissipata (Kiitz.) Grun. Hveravellir, at tempera- 
tures of 38° and 49° C. In spray of small geyser, tem mp. 85° C, 
51. Nitzschia echrace (Ag.) W. Sm. var. “ym (W. Sm.) Grun. 
In stream from Gre at Geyser, mean temp. 40° C 
52. Niteschia Palea (Kiitz.) W. Sm. Hyeravelii, temp. 38° 
and 49° (C, 
Var. fonticola Grun. Hveravellir, temp. 55° C. 
itzschia communis Rabenh. ap temp. 55°C. In 
stream dem Great Geyser, mean temp. 40° C. 
54. Nitzschia amphibia Grun. With the preceding species. 
5. Melosira distans Kiitz. var. nivalis (W. Sm.) Van Heurck. 
Hveravellir, temp. 24° and 55° C. 
_ 56, Melosira crenulata Kiitz. Hveravellir, temp. 49° C. 
IT. eee FRoM A Hor Sprine in tHe Matay Peninsvra. 
A time ago, Mr. R. H. Yapp, of Caius College, Cambridge, 
very Kindly forwarded to me a bottle of alge obtained from a hot 
spring at Sira Rimau, in the Malay Peninsula, dain | the Skent 
Expedition in 1899-1900. The spring was sulplurous, and the 
temperature of the water was 39:6° CG. The materi consisted 
Principally of a new species of 8 ymploca, which I have the honour 
oO name after its discoverer. Amongst this si < species of 
Phormidium, also new, and a ia species of Diatom 
Myxopuyces&. 
- Symploca Yappii, sp. n. (Bi 21-24), Fasciculato-cispi- 
tosa, eruginea vel ne meine “Fasci culis eyed tor oe 
diametro paullo ae 1:8-2°4 » longis; dis ; aa 
Spiculs, non Panaiatis; cellula ane rotundata, vix attenuata 
a ch, 2 
“ed Sheaths, and by the shorter cells. From 9. thermalis iit) 
orn ah., a species also found in hot springs 
Africa, it is ‘dune cain by the much larger tufts, simple pd 
