SUPPLEMENT. 297 
To be inserted at page 91 — 
Spirogyra velata. Nordst. Lund. Univ. Arsskrift, 1872, Vol. 1x. 
Sterile cells with the ends truncate, 3-4 times as long as 
a chlorophyll band single, making 14 to 24 turns in the 
spiral, 
Spores elongated-oval, polymorphous, 14 to 8 times as long 
as broad ; epispore thick, composed of four membranes; the 
second is hyaline and scrobiculate; the third is coloured 
(Nordstedt). 
Sporiferous cells a little swollen or not at all, sometimes 
shorter, sometimes a little longer than the spores. 
Size. Cells 035--04mm.; zygospore :06 xX :035—-085 x 
045 mm. 
Petit Spirogyra, p. 25, t. 7, fig. 1-5. 
In ditches. | 
England (Leicester. F. Bates). 
The zygospore has a broad hyaline border finely denticulate with the 
scrobiculations of the second membrane. 
Plate CXXX, fig. 1. a, sterile cells X 200; b, sterile cell x 400; 
¢, fertile cells with zygospores X 200 diam.; d, e, f, zygospores with the 
investing cells X 400 diam. 
At page 165, after @. capillare, add — 
Cdogonium capilliforme. Kutz. Spec. 367 (?). 
Oogonia single, a little swollen, obversely egg-shaped, open- 
ing with a superior pore; oospores ellipsoid-globose or cylin- 
drically globose (almost four-angled in optical section), not 
filling the oogonia; male plants a little more slender than the 
females ; spermogonia 2-10 celled, alternating with the vegeta- 
tive cells; terminal cell obtuse. 
Sizg. Cells of female -03--034 mm., 1} to 3 times as long ; 
of male :024-'028 mm., 14 times as long ; oogonium *042--048 
x 051-062 mm; oospore :037-'045 x 04-05 mm., usually 
°039-'04; sperm. cell -02--025 x ‘008-01 mm. 
Wittr. Mon. Cidog. p. 31. Kutz. Tab. Phyc. iii, t. 37, f. 
3 (2). x 
In pool and ditches. 
Britain (Leicester. F. Bates). 
Plate CXXIX, fig. 4. a, female filament with oogonia X 400 diam. ; 
b, male cells with alternating spermogouia X 400 diam. 
27 
