15 
CYMBELLA Ag. 
Cymbella amphicephala Naegeli, in Kiitz., Sp. Alg., p, 890. A. Schmidt, 
Atlas, PI. 9, fig. 62. Van Heurck, Syn. Diat. Belg., PI. 2, fig. 6. Boyer, 
Diat. Philadelphia, PL 18, fig. 16. 
Little River, N.S. 
Cymbella aspera (Ehrenb.) Cleve, Sv. Vet.-Akad. Handl. II, vol. 26, 
p. 175. (Cymbella gastroides Kiitz.) A. Schmidt, Atlas, PI. 9, figs. 1, 2. 
Van Heurck, Syn. Diat. Belg., PI. 2, fig. 8. Boyer, Diat. Philadelphia, 
PI. 18, fig. 1. 
Generally distributed, but not common in the eastern deposits. 
Cymbella cesatii (Rab.) Grun., in A. Schmidt, Atlas, PI. 71, figs. 48, 49. 
Van Heurck, Syn. Diat. Belg:, PI. 8, fig. 35. 
Slack lake, N.S.; Desert river, Que. 
Cymbella cuspidata Kiitz., Bac., p. 79. A. Schmidt, Atlas, PL 9, 
fig. 50. Van Heurck, Syn. Diat. Belg., PL 2, fig. 3. Boyer, Diat. Phila- 
delphia, PL 18, fig. 17. 
Generally distributed in the eastern deposits. 
Cymbella ehrenbergii Kiitz., Bac., p. 79. A. Schmidt, Atlas, PL 9, 
figs. 6 to 8. Van Heurck, Syn. Diat. Belg., PL 2, fig. 1. Boyer, Diat. 
Philadelphia, Pl. 18, fig. 9. 
Generally distributed in the eastern deposits. 
Cymbella gracilis (Rab.) Cleve, Sv. Vet.-Akad. Handl. II, vol. 26, 
p. 169. (Cymbella scotica W. Smith.) A. Schmidt, Atlas, Pl. 10, figs. 
36, 37, 40. Van Heurck, Syn. Diat. Belg., Pl. 3, figs. 20, 21. Boyer, 
Diat. Philadelphia, PL 18, fig. 20. 
Generally distributed in the eastern deposits. 
Cymbella heteropleura (Ehrenb.) Kiitz., Bac., p. 79. A. Schmidt, 
Atlas, Pl. 9, figs. 4, 5. Boyer, Diat. Philadelphia, PL 18, fig. 10. 
Trout lake, Earltown lake, Brora lake, N.S.; Prospect lake, B.C. 
Cymbella lanceolata (Ehrenb.) Van Heurck, Syn. Diat. Belg., Pl. 2, 
fig. 7. A. Schmidt, Atlas, Pl. 10, figs. 8, 9. Boyer, Diat. Philadelphia, 
PL 18, fig. 4. 
Generally distributed. 
Cymbella microcephala Grun. in Van Heurck, Syn. Diat. Belg., PL 8, 
fig. 36. 
McKay lake, Ont. 
Cymbella parva (W. Smith) Cleve, Sv. Vet.-Akad. Handl. II, vol. 26, 
p. 172. Cocconema parvum W. Smith, Syn. Brit. Diat. 1, Pl. 23, fig. 222. 
A. Schmidt, Atlas, PL 10, figs. 14, 15. Boyer, Diat. Philadelphia, Pl. 38, 
fig. 14. 
Bass River lake, N.S. 
