47 
f 
form and size of the cells seem to me to agree best with this species. 
(Fig. 41: a from the front, b from above, ¢ trom the side.) adth 
18-21, isthmus scarcely a third as broad, length 26-28 ». In each 
semi-cell is a Porastophars with a well-defined pyrenoid. The form 
ghinit. This species 
occurs in different varieties very widely distributed, but I do not find 
that it has hitherto been attributed to Australia.” —Moebius. 
Hab.: Waterhole, Victoria Park, Thos. L. Bancroft. 
C. obsoletum, (Hantzsch) Reinsch. Prof. Moebius gives the 
following note :—“Seen from above, almost circular ; distinguished by 
the short spines at each of the four corners contiguous to the 
constriction. My dimensions are intermediate between those given 
by De Toni (Syl 
Batay., p. 7): length 52 , breadth 56 w, breadth of the isthmus 26 yp. 
) more considerably than is the case in C. Mene 
4 ispheres, with a sinus extending outwards after the manner of the 
Oey letter gamma (y), the lower corners suddenly pointed into a 
| short Spine; apex plano-convex ; two enoids in each semi-cell ; 
‘Membrane finely punctate; cells seen from above, elliptical ; from the 
side almost circular (whole cell somewhat biscuit-shaped.)” : 
Ha urpengary, Thos. L Bancroft. Also in Europe, Burma, and Java. 
ot orme, Archer. Cooke’s British Desmids, 104. Segments 
puform, im end view equally elliptic. Zygospore globose, armed with 
; oe ‘pmes, which are cleft at the summit. Size: Length, 50,; diam., 
; & reniforme, var. compressum, Nordst. New Zealand 
‘ Peshwater gee 
= g.42: From Otto N ordstedt’s New Zealand Freshwater Alge. 
Prof. Moebius observes :— Found in numerous examples, which 
var. 
i ass. 
“dip of the cells from above, by which they appear elongate- 
with almost parallel sides lon itudinally, and in the arrange- 
ee ta the puncta tioei the m iene in longitudinal and oblique 
ts Cells 56-62 # long, 50-52 pw broad, isthmus 16 » broad. 
Neo,” Pressa is known in New Zealand; the typical form in Europe, 
MM and South. America.” 
as Ctulatum, Nordst. New Zealand Freshwater Alge, 
“tenes? ‘ Moebius Says —" The examples found iyo age? to = 
nk i, and description given by Nordstedt (New Zeal. B-, ee 
12, +. 8). Length and breadth of the cells about 30 pe; 1s 3, 
‘7, road. Hitherto only known in New Zealand. ” 
tae 2: From Otto Nordstedt’s New Zealand Freshwater Alge. 
ye Burpengary, Thos. L, Bancroft. Also in New Zealand. 
