19 
Neidium bisulcatum (Lagerst.) Cleve, Sv. Yet.-Akad. Handl. II, 
vol. 26, p. 68. Navicula bisulcata Lagerstedt, Bihang, Sv. Vet.-Akad. 
Handl., vol. 1, p. 31, PL 1, fig. 8. A. Schmidt, Atlas, PL 49, fig. 17. 
Mayflower P.O., Slack lake, N.S. Rare. 
Neidium hitehcockii (Ehrenb.) Cleve, Sv. Vet.-Akad. Handl. II, 
vol. 26, p. 69. Navicula Hitehcockii Ehrenb. A. Schmidt, Atlas, Pl. 49, 
fig. 35. Boyer, Diat. Philadelphia, Pl. 21, fig. 15. 
Salmon river, Earltown lake, Brora lake, N.S. 
Neidium iridis (Ehrenb.) Cleve, Sv. Vet.-Akad. Handl. II, vol. 26, 
p. 69. Navicula firma Kutz. A. Schmidt, Atlas, PL 49, figs. 2, 3. Boyer, 
Diat. Philadelphia, Pl. 21, fig. 17. 
Generally distributed. 
Neidium tumescens (Grun.) Cleve, Sv. Vet.-Akad. Handl. II, vol. 26, 
p. 70. Navicula firma tumescens Grun. A. Schmidt, Atlas, PL 49, fig. 10. 
Bass River lake, N.S. 
diploneis Ehrenb. em. Cleve 
Diploneis elliptica (Kiitz.) Cleve, Sv. Vet-Akad. Handl. II, vol. 26, 
p. 92. Navicula elliptica Kiitz. A. Schmidt, Atlas, Pl. 7, fig. 20. Boyer, 
Diat. Philadelphia, Pl. 20, fig. 14. 
Quamichan lake, Chilliwack, B.C. 
Diploneis finnica (Ehrenb.) Cleve, Acta Soc. Fauna et Flora Fennica, 
vol. 8, p. 43, PL 2, fig. 11. 
Generally distributed. 
Diploneis ovalis (Hilse) Cleve, Sv. Vet.-Akad. Handl. II, vol. 26, p. 92. 
Navicula ovalis Hilse. A. Schmidt, Atlas, PL 7, fig. 33. 
Little River, Earltown lake, N.S.; Moncton, Pollet lake, N.B. 
MASTOGLOIA Thw. 
Mastogloia dansei Thw. W. Smith, Syn. Brit. Diat., vol. 2, p. 64. 
Suppl. Pl. 62, fig. 388. Van Heurck, Syn. Diat. Belg., PL 4, fig. 18. 
McKay lake, Ont. 
st Aim on ei s Ehrenb. 
Stauroneis acuta W. Smith, Syn. Brit. Diat., vol. 1, p. 59, PL 19, fig. 
187. Van Heurck, Syn. Diat. Belg., Pl. 4, fig. 3. Boyer, Diat. Phila- 
delphia, PL 27, fig. 2. 
Little River, Folly lake, Little Gummel lake, Earltown lake, N.S.; 
Fitzgerald lake, Moncton, N.B.; McKay lake, Ont. 
Stauroneis anceps Ehrenb. W. Smith, Syn. Brit. Diat., vol. 1, p. 60, 
Pl. 19, fig. 190. Van Heurck, Syn. Diat. Belg., Pl. 4, fig. 4. 
Generally distributed in the eastern deposits. 
