16 
Cymbeila stodderi Cleve, Sv. Vet.-Akad. Handl. II, vol. 26, p. 163. 
Yermoloff, in Jour. Quekett Micr. Club, ser. 2, vol. 13, vol. 422, PI. 26, figs. 4, 5. 
Little River, Slack lake, Folly river, Little Gummel lake, Clear lake, 
Brora lake, near Sydney, N.S.; Fitzgerald lake, N.B.; Desert river, Que. 
This form and its variations allied to Navicula monmouthiana Grun. are 
exhaustively treated in YermolofFs article. 
Cymbeila ventricoea Kiitz., Bac., p. 80. (Encyonema caespitosum 
Kiitz. A. Schmidt, Atlas, PL 10, figs. 56, 57) (Encyonema lunula A. 
Schmidt, Atlas, PI. 10, figs. 42, 43). Van Heurck, Syn. Diat. Belg., PI. 
3, fig. 15. Boyer, Diat. Philadelphia, PI. 18, figs. 14, 22. Variable in 
outline. Occurs in nearly all of the deposits. 
amphora Ehrenb. 
Amphora ovalis (Br6b.) Kiitz., Bac., p. 107. Van Heurck, Syn. Diat. 
Belg., PI. 1, fig. 1. Boyer, Diat. Philadelphia, PI. 15, fig. 7. 
Occasional in the Nova Scotia, New Brunswick, and Vancouver Island 
deposits, B.C. 
amphiprora Ehrenb. 
Amphiprora ornata Bail. Smith. Contr., vol. 2, p. 38, PL 2, figs. 
15, 23. Van Heurck, Syn. Diat. Belg., Pl. 22 bis, fig. 5. Boyer, Diat. 
Philadelphia, PL 14, figs. 6, 7. 
McKay lake, Ont. 
GOMPHONEMA Ag. 
Gomphonema acuminatum coronatum (Ehrenb.) Van Heurck, Syn. 
Diat. Belg., PL 23, fig. 15. A. Schmidt, Atlas, Pl. 239, fig. 26. Boyer, 
Diat. Philadelphia, PL 19, fig. 7. 
Generally distributed. 
Gomphonema acuminatum elongatum (W. Smith) Van Heurck, Syn. 
Diat. Belg., Pl. 23, fig. 22. A. Schmidt, Atlas, Pl. 239, fig. 26. 
Earltown lake, N.S. 
Gomphonema angustatum (Kiitz.,) Grun., in Van Heurck, Syn. Diat. 
Belg., PL 24, figs. 49, 50. A. Schmidt, Atlas, Pl. 234, figs. 24, 25. Boyer, 
Diat. Philadelphia, Pl. 19, fig. 18. 
Earltown lake, N.S.; Blackwater river, B.C. 
Gomphonema augur Ehrenb. Van Heurck, Syn. Diat. Belg., Pl. 28, 
figs. 28, 29. Boyer, Diat. Philadelphia, PL 19, fig. 21. 
McKay lake, Ont. 
Gomphonema constrictum capitatum (Ehrenb.) Van Heurck, Syn. 
Diat. Belg., PL 23, fig. 7. Boyer, Diat. Philadelphia, Pl. 19, fig. 22. 
Generally distributed. 
Gomphonema gracile Ehrenb., in Van Heurck, Syn. Diat. Belg., PL 
24, fig. 12. A. Schmidt, Atlas, Pl. 230, fig. 32. 
Generally distributed. 
