26 
Surirella linearis W. Smith, Syn. Brit. Diat., vol. 1, p. 31, PI. 8, fig. 58. 
Boyer, Diat. Philadelphia, PL 35, fig. 8. A. Schmidt, Atlas, PL 23, fig. 27. 
Generally distributed in Nova Scotia and New Brunswick; McKay 
lake, Ont. 
Surirella oblonga Ehrenb., Boyer, Diat. Philadelphia, PL 35, fig. 9. 
Big Totten lake, Sydney, N.S.; Moncton, Stannard lake, N.B. 
Surirella robusta Ehrenb., Van Heurck, Syn. Diat. Belg., PL 71, fig. 1. 
Boyer, Diat. Philadelphia, Pl. 36, fig. 2. 
Slack lake, Trout lake, Big Totten lake, Little Gummel lake, Earl- 
town lake, N.S. 
Surirella splendida (Ehrenb.) Kiitz., Bac., p. 62. A. Schmidt, Atlas, 
Pl. 22, figs. 15, 16. Boyer, Diat. Philadelphia, PL 35, fig. 3. 
Generally distributed and variable. 
Surirella tenera Greg. Quart. Jour. Mic. Sci., vol. 4, p. 11, Pl. 1, fig. 38. 
Boyer, Diat. Philadelphia, Pl. 35, fig. 6 (var.). 
McKay lake, Ont. 
Surirella tenera splendidula A. Schmidt, Atlas, PL 23, figs. 4, 5, 6. 
McKay lake, Ont. 
CYMATOPLETJRA W. Smith 
Cymatopleura elliptica (Br6b.) W. Smith, Syn. Brit. Diat., vol. 1, p. 
37, PL 10, fig. 80. Van Heurck, Syn. Diat. Belg., Pl. 55, fig. 1. Boyer, 
Diat. Philadelphia, Pl. 37, fig.l. 
McKay lake, Ont. 
Cymatopleura solea W. Smith, Syn. Brit. Diat., vol. 1, p. 36, PL 10, 
fig. 78. Van Heurck, Syn. Diat. Belg., Pl. 55, figs. 5-7. Boyer, Diat. 
Philadelphia, Pl. 34, figs. 8, 9. 
McKay lake, Ont.; Pukaist creek, B.C. 
