50 
STAURASTRUM, Meyen. 
ond more or less deeply constricted at the middle ; wpe 
eouler than long, often provided wit 
* angular or radiate, or circular with a lobed radiate margin, or we 
ob compressed with a process at ane extremity.—Cooke’s Britis 
esinid 8. 
ea dejectum, Bréb. eke British Desmids, 188. Segments 
mot lunate, or Bi ; constricted Pout E very short, awns 
infla n . 
‘Prof. Moe ba! note is as Baicwa: maak "in a few examples; 
from above triangular with Sounded angles and contracted sides Gel 
of the side, 35 p.) Awns turned outwards, as in var. paten: 
Nordst.; the reverse sides not B Seidres as in this ee but sli ahtly 
concave, as is the case in many 
Fig. 47: a, living frond ; ‘ aes frond; ¢, variety; 4 ef 
end views; g, zygospore.—Coo e, Le. 
tree Burpengary, Thos. L. Bancroft. Found also in Europe and 
mn 
Ss 
eae 
5 
la) 
Rm 
° 
ke 
3 
Be 
(2) 
ie") 
North 
wi 
cells tally better with var. bicornis than with subsp. tonsd, 
Length of the cells, 24-30 »; breadth, 48-56 p; of the isthmus, 9» 
be Ore form is known in Europe and North America, var. bicorns 
Hab.: Burpengary, Thos. L. Bancroft. Also i in Europe and N. Americ 
S. sagittarium, Nordst. Freshwater Al ¢ New Zealand : 
Austra, 37. Pr of. Moebiu ssa iter = Only yee lf pee seen, ve 
‘ and whi 4 
figu re ‘(Fig . 48). This figure differs Sais Y’Nordstedt’s 3 (New Ze ‘hat ‘ 
Alge, Pl. iv. , Hig. 6) inthe fact that it is not eight but six-rayed, t : 
the rays terminate not in three but four points, and that the 
upon the dorsal surface are not single but do uble. The inne ¢ ith 
with which the semi-cells come into mutual contact 18 surrounded W! 
a wreath of awns, alternately greater ae less, extending oule the : 
we pointed lines in the fi re). Diameter of the cell = has 
m 
gure 
rays, 65-5 » (according to Nordstedt, 50- 62 S. sa ‘ita “tu 
. hitherto only been known in New Zealand.” fe : oe 
gs Ne 
New echaad. Burpengary, Thos. L. Bancroft. Enoggera, W. d. Ege bee : 
