25 
nitzschia Hassall em. Grun. 
Nitzschia denticula Grun. in Cleve and Grun., Sv. Vet.-Akad. Handl., 
vol. 17, p. 82. Van Heurck, Syn. Diat. Belg., PI. 60, fig. 10. 
McKay lake, Ont. 
Nitzschia palea (Kiitz.) W. Smith, Syn. Brit. Diat., vol. 2, p. 89. 
Synedra fusidium Kiitz. (acc. to W. Smith), Nitzschia fusidium H. L. 
Smith. Type slide No. 343. Boyer, Diat. Philadelphia, PI. 32, fig. 15. 
H. L. Smith’s specimens from Upsala, Sweden, correspond exactly to this 
form which is variously figured and described by different authors. 
Bass River lake, N.S. 
Nitzschia scalaris (Ehrenb.) W. Smith, Syn. Brit. Diat., vol. 1, p. 39, 
PI. 14, fig. 115. Van Heurck, Syn. Diat. Belg., PI. 60, figs. 14, 15. Boyer, 
Diat. Philadelphia, PI. 33, fig. 6. This form occurs usually in brackish water. 
Little River, Mayflower P.O., N.S. 
surirella Turpin 
Suruella anceps (Br6b.) Lewis, Proc. Acad. Phila., vol. 15, p. 341, Pl.l, 
fig. 3. Boyer, Diat. Philadelphia, PI. 34, fig. 2. 
Generally distributed in Nova Scotia and New Brunswick. 
Surirella arctissima A. Schmidt, Atlas, PI. 56, figs. 13, 14. Boyer, 
Diat. Philadelphia, PI. 34, fig. 4. 
McQuade lake, Little River, Slack lake, Folly lake, Trout lake, 
Sydney, N.S. 
Surirella biseriata (Ehrenb.) Breb. W. Smith, Syn. Brit. Diat., vol. 1, 
p. 30, PI. 8, fig. 57. Van Heurck, Syn. Diat. Belg., PL 72, figs, 1, 2. Boyer, 
Diat. Philadelphia, PI. 39, fig. 12. 
McKay lake, Ont. 
Surirella constricta Ehrenb. (not W. Smith). Mikrogeologie, PI. 14. fig. 37. 
Fitzgerald lake, N.B. 
Surirella elegans Ehrenb., Kiitz., Bac., p. 60. Van Heurck, Syn. 
Diat. Belg., PL 71, fig. 3. A. Schmidt, Atlas, PL 21, fig. 19. Boyer, Diat. 
Philadelphia, Pl. 36, fig. 1. 
Earltown lake, N.S. 
Surirella guatamalensis Ehrenb. Surirella cardinalis Kitton. A. 
Schmidt, Atlas, Pl. 31, fig. 11. Boyer, Diat. Philadelphia, Pl. 36, fig. 5. 
Earltown lake, N.S.; McKay lake, Ont. 
Surirella intermedia Lewis, Proc. Acad. Phila., vol. 15, p. 338. A. 
Schmidt, Atlas, PL 284, fig. 6 (forma acuta Fricke). Boyer, Diat. Phila- 
delphia, PL 34, fig. 3. 
McQuade lake, Bass River lake, Folly lake, Trout lake, Sydney, 
N.S.; Stannard lake, Fitzgerald lake, N.B. 
