39 
Prof. Moebius remarks :—“ The proportion of the length of the 
cells to their breadth varies in this species ; generally they are nearly 
half as long as broad. n this case the length amounted to about 
two-thirds of the breadth (12-14 » long, 16-20 p broad). Moreover, 
| cells are almost as long as broad 
E Fig. 
tygospore.—F'rom Cooke’s British Desmids. a 
| «. ~8-: burpengary, Thos. LZ. Bancroft. Also found in Europe, North America, 
P Giketis, and Thiber . 
ONYCHONEMA, Wallich. 
7 Filament compressed; margins inciso-serrate ; joints deeply 
constricted, and united to each other y diverging sub-capitate 
Processes (cornua).—Cooke’s British Desmids, 6. ; 
i remarkable form of the overlapping and alternating horns 
. (cornua), and the uncinate processes given off from the extremities of 
the segments, at once distinguishes this genus from all others.— 
| x Cooke, le. 
_ ~©. filiforme, (Ehr.) Roy et Bisset. Prof. Moebius gives this 
hote :—“ Tn isolated fragments of filaments, the cells of which were 
<4 «long, and equally broad. These dimensions tally with those 
oe to the typical form; Nordstedt’s examples from New 
} “*tland were somewhat larger.” 
3 Fig. 29: From Otto Nordstedt’s New Zealand Freshwater Alge. 
Amen? {, Burpengary, Thos. L. Bancroft. Also met with in Europe, North 
- ica, New Zealand, J apan, and Burma. 
a G. ~GYMNOZYA, Ebr. 
a , Moniliformis, (Ehr.) “ Typical form cells 21-28 » long, 16-19 
| ane end, 11-14 » broad» the outline of the membrane very 
: ebius. 
 Mstinet.”—M oebi 
= . Sab.: Bor en i North America 
| oan gary, Thos. L. Bancroft. Also found in Europe, North md 
-: Jara, Siberia, N ew Zealand, Brazil, the Seodwish Islands. A var. gracilescens in 
: and New Jersey, 
Meneg. (Penium Brébissonii, Ralts, in Cooke’s 
, 43). Frond smooth, cylindrical with rounded ends, 
. central band inconspicuous, zygospore at first quadrate, 
lcular, conjugating fronds persistent. Size: Diam., 16-17 » 
15-30 w (K.).—Cooke, lic. | 
© following is Prof. Moebius’ note:—“ Cells 25 p broad, 60 A 
With bro d rounded ends.” (Corresponding to Fig. 6c, Pl AAY. 
8 British Desm. cS 
‘00; a, b, living fronds; c, empty fronds; ¢, young zygospore; 
Tah) 8o8Pore.—Cooke, Le. Be ‘ 
“es Burpengary, Thos. L. Bancroft. Found in Europe, America, an 
