43 
ae 
th. (= Gl. natans), as well as with Kirchner’s illustration in his 
Microscopic Flora of Freshwater (PI. IV., Fig. 126). The dimensions 
ofthe Australian alga correspond exactly to those given by Bornet 
and Flahault (Revision des Nostoc. hétéroc.). Tbe vegetative ort 
ion of usua 
@ shape. @ spores are 13-14 » thick ; the longest, which I have 
measured, are 52 » long; the colourless heterocysts are 8 » thick. 
Known from Europe and North America.” 
Hab.: Dalby, Darling Downs, May, 1893, Dr. Thos. L. Bancroft. 
(Plate XI., Fig. 15-19.) 
4 . 
SIROSIPHONIACE, Rabenh. ‘ 
‘HAPALOSIPHON, Neg. 
E. Pumilus, Kirchn. Prof. Moebius remarks :—“ Again found 
Sundantly in the form described on the former occasion.” (See 
--*otany Bulletin No. VI, p- 51.) 
: Hab. : Glasshouse Mountains, September, 1892, Dr. Thos. L. Bancroft. 
(Plate XI., Fig. 10-14.) 
/  STIGONEMA, Ag. 
; 
. 
*% 
u ra 
upon each other, the outer membrane seems to be 
to become excessively thin. Both membranes are 
