NOTES ON RRITISH DESMIDIEX. 291 
von gi from a moraine at Cammie, Aberdeenshire, on 2nd June, 
gi lineatum Ralfs.—Bosullow, Cornwall, abundantly conjugated ; 
mes e a common species, its zygospore is rare; has been observed 
in Ireland. 
ea et bes — With = large form of C. Leibleinii Kiitz. ; 
both with zygospor Ca 
ea Nitrite Ralfs, var. ornata Bulnh.—Slewdrum Bog, 
‘ Mw sconferta Lund. — North Glen, Sannox, Isle of Arran; also 
amm 
M. tracyptera Lund.—Lindeth, near Bowness, Westmoreland. 
New to Britai 
Euastrum alii Wittr.—Minety, Wiltshire. 
EF. inerme.—Sannox, an, and Aberdeenshire. 
n-nachie. 
. cyclicum Lund.—Den of Gight, Aberdeenshire. Var. arcticum 
Nordst sine , Wilts. 
um Bek var. trigibberum Nordst., ‘ Desmidiew Arctoe,’ 
1876, re vii. 19. — Rain-water pool, Ove rley, near Cirencester. 
Angles more produced than in the Seitabargeri species. New to 
C. Spo ae Grun. f., spitzbergensis Nordst., ‘ Desmidier 
Arctoz,’ t. vi. f. 15.—Fyvie, Aberdeenshite. 
C. plicatum ‘Reinach bbe-tien an, N. B. Large form, rare. 
—— ium Lund.— a 5 
C. sublobatum Arch.—Den of Gight ; and Haytor, Dartmoor. 
C. obliquum Nordst.—Den of Gight, and Pennyeuick. 
C. pseudarctoum Nordst.—Den of Gight. 
C. notabile f. minus Wille.—Den of Gight. 
C. pachydermum Lund., 8. minus Nordst —Den of Gight. 
C. sportella Breb.—Den - Gight. xia form. 
C. annulatum Nag.—Fyvi 
C. Reinschit Arch. on viral Moor, Penzance 
C. Turpini Lund.—Bangor; and Driffield Woods, Wilts. 
C. anceps Lund.—Den of Gight. 
C. Holmiense Lund., B. ong Lund.—Den of Gight. 
C. globosum Bulnh.—-Strachan, N. B. 
C. Nymanianum Grun.—Alt ton, Hant ts; and Cornwall. 
C. rectangulare Grun. = C. Gotlandicum Wittr. — Among Alga’ 
from Hulgarvon Moor, Bodmin 
Arthrodesmus sastiakssiente Ar ok —Ben-na-Chie, N. B. 
A, bijidus Breb.—Very abundant on water-plants, Fyvie 
A. Incus Hass., B. intermedius Wittr. — Abundantly conjugated. 
Cammie, N. B. 
Zanthidium Robinsonianum Arch. — Derrytrasna Bog, Co. Ar- 
magh. Conjugated abundantly; zygospores delicately furcate, 
tubereulose. No. 550, fasc. 11, Wittrock & Nordstedt, ‘ Alge 
arose comm. W. Joshua. This is, as far as I know, only the 
cond occurrence of this fine species. 
