9 
(55) Blackwater River , Cariboo and Coast Districts, British Columbia 
The geological relations of the deposit on Blackwater river are un- 
known. Tertiary sediments occur on the river, 1 possibly the diatomite 
deposit represented by sample No. 55 is of Tertiary age or has been derived 
from Tertiary beds. The following species were recognizable: Cymbella 
ventricosa, Diploneis finnica, Gomphonema angustatum , G, puiggarianum 
aequatoriale, Hantzschia amphioxys, Melosira granulata, Navicula pseudo- 
bacillum, AL semen, Pinnularia major, P. termes, P. viridis, Stauroneis 
phoenicenteron, Tetracyclus ellipticus clypeus. 
SYSTEMATIC LIST OF SPECIES 2 
Centricae 
MELOSIRA (Ag.) Kiitz. 
Melosira arenaria Moore, Ralfs in Ann. and Mag. Nat. Hist., vol. 12, 
p. 349, PI. 9, fig. 4. Van Heurck, Syn. Diat. Belg., PL 90, figs. 1-3. Schmidt, 
A., Atlas, PI. 179, figs. 15-19. 
This form, rare in North America, occurs in the Earltown Lake 
deposit, N.S. 
Melosira crenulata (Ehrenb.) Kiitz., Bac., p. 55. Van Heurck, Syn. 
Diat. Belg., PI. 88, figs. 3-5. Boyer, Diat. Philadelphia, PI. 1, figs. 1, 2. 
Generally distributed in the eastern deposits. 
Melosira distans (Ehrenb.) Kiitz., Bac., p. 54. Van Heurck, Syn. 
Diat. Belg., PI. 86, figs. 19, 20. Boyer, Diat. Philadelphia, PI. 1, figs. 8, 9. 
Generally distributed in the eastern deposits. 
Melosira distans laevissima Grun,, in Van Heurck, Syn. Diat. Belg., 
PI. 86, fig. 24, With finer markings than in the type species. 
Occurs in the Little River and Bass River Lake deposits, N.S. 
Melosira granulata (Ehrenb.) Ralfs in Prit. Inf., p. 820. Van Pleurck, 
Syn. Diat. Belg., PI. 86, figs. 9-11. Boyer, Diat. Philadelphia, PI. 1, 
fig. 10. A. Schmidt, Atlas, PI. 181, figs. 58, 59, 60, 62. 
Occurs in the Clear Lake deposit, N.S.; also in the deposits in the 
vicinity of Quesnel, B.C., in which the variations are numerous. The 
variety known as spiralis (Ehrenb.) Grun., Van Heurck, Syn. Diat. Belg., 
PL 87, figs. 19-22, also is found, with many intermediate forms, in the Loon 
Lake deposit, B.C. 
Melosira undulata (Ehrenb.) Kiitz., Bac., p. 54. A Schmidt, Atlas, 
PL 176, figs. 4-6; PI. 182, fig. 51 (as M. Gowenii A. Schmidt). Boyer, 
Diat. Philadelphia, PL 1, figs. 15-17. 
Occurs rarely in the Little River deposit, N.S. 
Dawson, G. M.: Geol. Surv., Canada, Rept. of Prog. 1875-76, pp. 255-256. 
2 Note, Certain species in the list of McKay Lake diatoms (See table), which was prepared after the comple- 
tion of the systematic list, are not included. 
The present list should, with Prof. Bailey’s check-list, furnish a nearly complete list of the recorded Canadian 
diatoms. See Bailey, L. W.: “An Annotated Catalogue of the Diatoms of Canada Showing Their Geographic 
Distribution”; Contr. to Can. Biol., N.S., vol. II, pp. 31-68 (1924), 
23753— 2J 
