11 
MERIDIGN Ag. 
Meridion circulare (Grey.) Ag., Consp. Crit. Diat., p. 40. W. Smith, 
Syn. Brit. Diat., vol. 2, p. 6, PI. 32, fig. 277. Boyer, Diat. Philadelphia, 
PI. 10, figs. 1 to 3. Not common. 
Occurs in the deposits of North river, Loon lake, Mayflower P.O., 
Folly river, Earltown lake, N.S. 
fragilaria (Lyngb.) Rab. 
Fragilaria construens (Ehrenb.) Grun., Zool.-Bot. Ges. Wien, vol. 12, 
p. 371, PI. 7 (4), fig. 10. Van Heurck, Syn. Diat. Belg., PI. 45, fig. 11. 
Boyer, Diat. Philadelphia, PI. 10, fig. 30. Quite variable. 
Abundant in the Cobble Hill deposit, B.C.; Jacquot river, Que. 
Fragilaria construens venter Grun., in Van Heurck, Syn. Diat. Belg., 
PI. 45, fig. 26. With the type. 
McKay lake, Ont. 
Fragilaria elliptica Schum., Preuss. Diat., p. 52, PI. 1, fig. 5. Van 
Heurck, Syn. Diat. Belg., PI. 45, fig. 17. Abundant in Jacquot River 
deposit, Que. 
Fragilaria mutabilis (W. Smith) Grun., Zool.-Bot. Ges. Wien, vol. 12, 
p. 369. Van Heurck, Syn. Diat. Belg., PI. 45, fig. 12. 
Abundant in Jacquot River deposit, Que. 
Fragilaria mutabilis intercedens Grun., in Van Heurck, Syn. Diat. 
Belg., PI. 45, fig. 13. 
Folly river, N.S.; Cobble Hill, B.C. 
Fragilaria undata W. Smith, Syn. Brit. Diat., vol. 2, p. 24, PI. 60, fig. 
377. Van Heurck, Syn. Diat. Belg., PI. 44, fig. 9. A. Schmidt, Atlas, 
PI. 296, figs. 48 to 61. Boyer, Diat. Philadelphia, PI. 10, figs. 24 to 29. 
Quite variable in outline. 
Occurs in the deposits of Little River, Mayflower P.O., Bass River 
lake, near Sydney, N.S.; Ste. Anne river, and (abundant) at Jacquot 
river, Que. 
Fragilaria virescens Ralfs, Ann. and Mag. Nat. Hist., vol. 12, p. 110, 
PI. 2, fig. 6. Van Heurck, Syn. Diat. Belg., PI. 44, fig. 1. Boyer, Diat. 
Philadelphia, PI. 10, figs. 20, 21. 
Bass River lake, Folly lake, N.S. 
Fragilaria virescens exigua Grun., in Van Heurck, Syn. Diat. Belg., 
PI. 44, fig. 3. 
Abundant in Jacquot River deposit, Que. 
Fragilaria virescens oblongella Grun., in Van Heurck, Syn. Diat. Belg., 
PI. 44, fig. 6. 
Occasional in the eastern deposits. 
