20F Canadian Arctic Expedition, 1913-18 
i 
Navicula elongata Grun. 
Sch. Nordsee Diat., Pl. 2, fig. 42; Sch. Atlas, Pl. 50, fig. 27 (not 28-29). 
There is doubt of this being able to stand alone; Cleve claims it is a variety 
of N. Liber W. Sm. Found at Stations 20b-c and 23. 
Navicula erosa Cl. 
Sch. Atlas, Pl. 259, fig. 7. 
Found only at Station 43a and scarce. 
Navicula Eudoxia A. Sch. 
Sch. Atlas, Pl. 8, figs. 39-40; Pl. 70, fig. 71. 
I dissent from Cleve’s making this a variety of N. contigua A. Sch., the type 
figure of which is fig. 43 in the above, and his suggestion that all are small, 
corroded specimens of N. gemmata Grev. is absurd. Found at Stations 23, 
43a and 438g. 
Navicula exemta A. Sch. 
Sch. Atlas, Pl. 11, fig. 28 (not 29); Sch. Nordsee Diat., Pl. 2, fig. 5. 
Found at Station 439. 4 
Navicula forcipata Grev. 
Sch. Nordsee Diat., Pl. 2, figs. 16, 18; Atlas, Pl. 70, fig. 17. 
Found at Station 41. 
Navicula fusca Greg. 
Sch. Atlas, Pl. 7, figs. 1, 7, 8. 
. Only the varietal form shown above, to which is attached the unimportant 
“var, delicata A. Sch.,’’ was represented; found at Stations 41, 48a and 43c, 
and there frequent. 
Navicula Gastrum Ehr. var. Jenisseyensis Grun. 
Cl. and Grun. Arct. Diat., Ply 1, fig. 28. 
My specimens are duplicates of the above; but that it is an admissable 
variety of N.Gastrum will be seen to be doubtful if we compare with authentic 
figures of the latter, Ehr. Mikro., Pl. 5, sec. I, fig..12, and Van Heurck Syn., 
Pl. 8, fig. 27. Found at Stations 29g and 43c. 
Navicula gelida Grun. 
Grun. Diat. F. Jos. Land, Pl. 1, figs. 27-28; Sch. Atlas, Pl. 259, fig. 21. 
Found at Stations 20b-c and 23. 
Navicula glacialis Cl. 
Sch. Atlas, Pl. 6, figs. 37, 39, also fig. 36, no name. 
Both the type form (fig. 39) and the variety septentrionalis Cl. (fig. 37), 
originals from Spitsbergen, were found; Stations 41, 43b, 43c and 489. 
Navicula Grani (Jorg.) Gran. 
Jorg. Protist. Plankt., Pl. 7, fig. 25; Gran Nord. Plankt., p. 124, fig. 168. 
My specimens were larger than any hitherto recorded, being length 0-082 
mm., width 0-011 mm., as compared with 0-054 x 0-0057 mm. Found in 
plankton haul at Station 12b-c. 
Navicula humerosa Breb. 
Sch. Atlas, Pl. 6, figs. 3-5. 
Found in plankton haul at Station 18d. 
Navicula imperfecta Cl. 
Cl. Vega Diat., Pl. 36, fig. 34; Sch. Atlas, Pl. 259, figs. 9-10. 
The rhaphe is not bent sidewise at the centre, as seems to be the case in 
the above. Found at Station 27s. 
