200 NOTES OF ALGÆ. 
observation.* The genera and species are given in alphabe- — | 
tical order for convenience sake. : 
I. Species found in the vicinity of Aberdeen : 
Closterium acerosum, Ehr., C. Cornu, Ehr., C. Diane, Ehr, - E 
C. Digitus, Ehr., C. Ehrenbergii, Mgh., C. lineatum, Ehr., 
C. Lunula, Ehr., C. margaritaceum, Ehr., C. moniliferum, 
Ehr., C. rostratum, Ehr., C. setaceum, Ehr., C.striolatum, 
Ehr., C. Trabecula, Ehr., C. turgidum, Ehr. 
Cosmarium Botrytis, Mgh., C. crenatum, Ralfs, C. Cucumis, 
Corda, C. cylindricum, Ralfs, C. margaritiferum, Ralfs, 
C. ornatum, Ralfs, C. ovale, Ralfs, C. quadratum, Ralfs. 
Cylindrocystis Brebissonii, Mgh. 
Desmidium quadrangulatum, Ralfs, D. Swartzii, Ag. 
Didymoprium cylindricum, Kutz., D. Borreri, Ralfs. | 
Euastrum affine, Ralfs, E. binale, Ralfs, E. circulare, Hass 
. E. Didelta, Ralfs, E. gemmatum, Ralfs, E. oblongum, Ralfs, 
E. Pelta, Ralfs, E. rostratum, Ralfs, E. spinosum, Ralfs, 
i . E. verrucosum, Ehr. 
= Glæoprium dissiliens, Ralfs, G. mucosum, Ralfs. 
. Holocystis oscitans, Hass. 
. Micrasterias radiata, Hass., M. rotata, As. 
.. Pediastrum angulosum, Hass., P. Boryanum, Mgh., 5 con: 
strictum, Hass., P. ellipticum, Hass., P. heptactis, Mg? 
P. Napoleonis, Mgh., P. tetras, Ralfs. —.— D. 
Sespédesinus acutus, Meyen, S. dimorphous, Kutz 
Le qma (Dites e 60) as | | 
ree ipe oorr Se suec Pedum: 
