10F Canadian Arctic Expedition, 1913-18 
Amphora ocellata Donk. 
Micro. Journ., 1861, Pl. 1, fig. 11. 
Very scarce in only one dredging, Station 20b-c. 
Amphora ovalis Kitz. 
Sch. Atlas, Pl. 26, figs. 106-111. 
Common in several dredgings, Stations 20b-c, 23 and 41. 
Amphora Proteus Greg. 
Greg. Diat. Clyde, Pl. 13, fig. 81; Sch. Atlas, Pl. 27, figs. 2-3, 5, 6. 
Unusually large specimens of the type form were found in dredgings made 
at Stations 20b-c, 27s, 43a, 43b, 48c, 48g; and the.variety Kariana Grun. at 
Stations 41 and 43b. 
Biddulphia Gray 
Biddulphia aurita Breb. 
Sch. Atlas, Pl. 122, figs. 1-8. : : 
This cosmopolitan species occurs in most of the dredgings and is quite 
abundant in those from Stations 20b-c, 20g, 23 and 41. 
Biddulphia Edwardsii Feb. 
Van Heurck Syn., Pl. 100, figs. 9-10. 
All the specimens were varieties of the true type and showed a tendency to 
merge into the next species. Found in dredgings from Stations 20g, 23 and 
43b, and a plankton haul from Station 18d. 
Biddulphia obtusa (Kiitz.) Ralfs. 
Van Heurck Syn., Pl. 100, figs. 11-14. 
Small specimens and as a rule having the form shown in fig. 13 above. 
Found at Stations 20b-c and 20g, very abundant in the latter. 
Biddulphia polymorpha (Kiitz.) Mann. 
Van Heurck Syn., Pl. 104, figs. 3-4. 
Much confusion exists about the form of this diatom because several authors 
have united it with B. laevis without distinguishing between B. laevis Ehr. and 
B. laevis W. Sm., it being the same as the latter but clearly different from the 
former. As the old genus Cerataulus cannot be kept distinct from Biddulphia 
this species is here reclassified. Found in dredging from Station 41. 
Biddulphia Roperiana Grev. 
Van Heurck Syn., Pl. 99, figs. 4-6; Sch. Atlas, Pl. 120, figs. 20-24, especially 
ast. 
Found in dredgings from Stations 20g, 23, 43a and 43g, and a spiny variety 
at Station 20b-c. 
Campylodiscus Ehr. 
Campylodiscus angularis Greg. 
Greg. Diat..Clyde, Pl. 11, fig. 53; Deby Camp., Pl. 3, fig. 22. 
Found sparingly in dredgings from Stations 27s, 41, 43a, and 43c. 
Campylodiscus striolatus Grun. 
Sch. Atlas, Pl. 53, figs. 1-2. 
Deby, in general a good authority on this genus, gives a figure of this species 
but calls it C. Kutzingti Bail., see his Rev. Camp., Pl. 1, fig. 10. De Toniin Syl. 
Alg., p. 610, quotes this without indorsement. If the foregoing figures are 
compared with Bailey’s form figured in Wilkes Exp., Pl. 9, fig. 20, and the 
description read on p. 178, it will be clear the two cannot be united. Found in 
dredgings from Stations 20b-c, 23, and 43g, not abundant. ° 
