104 Notis ON SCOTCH FRESH-WATER ALGAE. 
N. eryptocephala Kitz. §., Orkney Is. 
N. dicephala Ehrnb. C., Ork ney Is. 
Pinnularia nobilis ae B., N., Aberdeen, Glen Lochaidh. 
P. major Rab i. 
P, Rabenhorstii Ralfs. , 
P. Tabellaria Ehrnb., var. acrospheria Rabh. C., Aberdeen. 
P. gibba Ehrnb. C., N., M., Ben a Abatinen 
P. alpina W. Sm. C., M., Gm oa Ceandor. 
. radiosa (Kiitz.) Rabh. C., Orkney Is., Aberdeen. 
P. borealis Khrnb. Ben Chiurn, Long 56 p; lat. 12 »; striis 
in 25 
= 
P. acuta W. Sm. 8. 
P. mesolepta W. Sm. B. 
P. divergens W. Sm. C., G., Gm., Corrie Ceandor, Ben Laoigh, 
sania Ag oo Botanical Gardens 
P. Brebissonii (Kiitz.) Rabb. Orkney Is. 
fr rustulia saxonica Rabh., forma aquatica Rabh. Frequent. 
Stauroneis Phenicenteron '(Nitzsch) Ehrnb. Frequent. 
S. anceps Ehrnb. 
Gomphonema tenellum ise bipre 8 
G. dichotomum Kitz. C.,G@ i, Gm., Glen Lochaidh. 
G. Vibrio Ehrnb.  §., C. 
G. capitatum Ehrnb. §&., C. 
G. constrictum Ehrub. S., M. 
G. geminatum Ag. 5., M., Glen Lochaidh. 
} equent 
G. olivaceum (Lyngb.) Kitz, id. 
G. intricatum Kitz. G., Gm., T., ep Lochaidh. 
Meridion circulare (Grev. ) Ag. G., ¥ 
M. constrictum Ralfs. TT. 
Tabellaria flocculosa (Roth) Kitz. SOunag: 
1’. fenestrata (Lyngb.) Kitz. Freque 
Tetracyclus emarginatus (Khrnb.) W. ‘Sm M. 
XPLANATION OF PiatE 333.—Fig. 1. Mougeotia igs te Boe ) var Scotica, 
nov. var. x 400. 2. Pediastrum tricornutum Borge. . P. Sturmii 
i rec heetns paucispinosa, 
x 520. 7&8. 
ictyospherium 
Ehrenbergianum Niig., var. minutum, noy. var. x 520. 17. Ditto, x 520. 
