26 F Canadian Arctic Expedition, 1913-18 
Pleurosigma lineare Grun. 
Perag. Pleuro., Pl. 9, fig. 11; Pl. 7, fig. 16, misnamed; Cl. N. and R. Diat., 
Pl. 1, fig. 8, misnamed. mere 
Not to be confused with P. tenuissimum W. Sm. Rhaphe line in first tefer- 
ence above incorrect. 
Found at Station 430. 
Pleurosigma longum Cl. 
Cl. and Grun. Arct. Diat., p. 49, Pl. 3, fig. 71; Perag. Pleuro., Pl. 2, fig. 2. 
One specimen measured was about 15 times as long as wide, namely length 
0-45 mm., width 0-031 mm., and suggesting var. kerguelense Grun. in Perag. 
Pleuro., Pl. 2, fig. 1, but without the lunate curves at the ends of rhaphe. Found 
at Stations 23 and 438c. 
Pleurosigma Normanii Ralfs. 
Perag. Pleuro., Pl. 4, fig. 6, misnamed. 
This is not to be confused with P. affine Grun., as is done by Peragallo. 
Found at Station 20b-c. 
Pleurosigma Parkerii Harrison. 
Perag. Pleuro., Pl. 8, fig. 33. 
One specimen at Station 27s. 
Pleurosigma speciosum W. Sm. var. gracilis Perag. 
Perag. Pleuro., Pl. 2, fig. 19. 
Found at Station 23. 
Pleurosigma strigosum W. Sm. 
W. Sm. Brit. Diat., Pl. 21, fig. 203; Perag. Pleuro., Pl. 5, fig. 1. 
My specimens are nearer Peragallo’s figure than the type shown by Smith. 
In form it closely resembles the untypical P. Stuxbergit in Grun. Diat. F. Jos. 
Land, Pl. 1, fig. 57, but the markings are coarser. Found at Stations 23 and 
43. 
Pleurosigma tenuissimum W. Sm. 
W. Sm. Brit. Diat., Pl. 22, fig. 213; Cl. and Grun. Arct. Diat., p. 58, Pl. 4, 
fig. 77. 
‘ Both the type form, first reference above, and the var. hyperborea Grun., 
second reference above, were found in the same dredging, Station 20b-c. 
Pleurosigma Wansbeckii Donk. 
Micro Journ., 1858, Pl. 8, fig. 7; Perag. Pleuro., Pl. 7, figs. 23, 24. 
This should not be confused with P. balticum W. Sm. Found at Stations 
20b-c and 48c, plentiful in the former. 
Pseudo-Amphiprora Stauroptera (Bail.) Cl., see Tropidoneis Stauroptera 
(Bail.) V. H. 
Pseudo-Eunotia Grun. 
Pseudo-Eunotia Larva Mann, sp. nov. 
Pl. I fig. 12. 
Valve arcuate, broad, its dorsal side evenly and strongly convex, its ventral 
side barely concave; ends blunt, rounded; markings of closely set rows of 
strong beads, generally transverse, slightly curved toward the apices; the 
beading close to the apices less developed, thereby giving a false semi-hyaline: 
appearance, somewhat overemphasized in the illustration. 
Length 0-037 mm., width 0-007 mm.,:11-2 lines in 0-01 mm. 
Scarce, found only at Station 43a. 
