New British Freshtvater Algse. By W. and G. S. West. 165 
longioribus ; dissepimenta distincta non granulata, cellula api- 
calis obtnsa. 
Crass, trich. 1 • 5-2*0 \i ; diam. yag. circ. 45 
Hah. Glen Tummel, Perthshire, Scotland. 
This species was observed in but small quantity ; it comes nearest 
to the marine species M. tenerrimus, but differs from it in many 
points. 
Order Lyngbye^:. 
Genus Oscillator ia Yauch. 
47. O. splendida Grev. 1824; Gomont, Monograph, des Oscillar., 
p. 244 ; Oscillar ia leptotricha Kutz., Phyeol. german., p. 158 ; 
Tabulae phycolog., i. p. 27, tab. 39, fig. ii. 
Yar. attenuata var. n. PL 1Y. fig. 58. 
Yar. apicibus longissime attenuatis (usque 30 fi) et 
tenuissimis. 
Cras3. trich. 2-2*3 
Hah. Baildon Moor, W. Yorks. Abundant in peaty 
ditches and pools, July 1895. 
The apices of this variety are much more elongated and attenuate 
than those of the typical form, though, like those, they are sub- 
capitate. 
1896 
y 
