KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. I8. Nz:o 5. 7 
3. Navicula Grenlandica Cu. N. Sp. 
Lanceolate with obtuse apices. Strie coarse, costate, very radiant and divergent, 
crowded around the centre of the valve (7'/, in 0,01 mm.) more distant between the 
centre and the ends (6 in 0,01 mm.), interrupted by furrows, parallel to the margins. 
Around the central nodule there is a very large orbicular area. 
Length 0,117 mm. Breadth 0,023 mm. 
Phi dpe 18 
Greenland, Davis Strait (very rare in Cx. et Mori. Diat. N:o 172). 
In its characters this species approches N. Trevelyana, but its form is entirely 
different. The strie are also more distant, being in WN. 7'revelyana 10 in 0,01 mm. 
The terminal nodules of MN. Grenlandia are peculiar and resemble those of N. Regula 
Cx. et Grun. (Ct. W. Ind. Diat. p. 5, Pl. 1, fig. 3.) 
4. Navicula Eugenie Cu. N. Sp. 
Valve very convex, linear, with rounded ends. Striew coarse, costate, radiant, 9 
in 0,01 mm., reaching the median line, interrupted by a line parallel to the margin. 
Median line undulate. Central nodule surrounded by a small area. Terminal nodules 
elongated. — F. V. Frustule constricted in the middle; ends truncate. 
Length 0,085—0,1 mm. Breadth 0,017 mm. 
Pl. TL, figs 16, "4,0. SL V., bo Be Ve 
Gallapagos Islands (Eugenie Exp.). 
5. Navicula Hennedyi var. undulata Cu. 
_ Oval with cunate ends and three undulations on each side. Strie distinctly punc- 
tate, marginal and around the median line. The strie near the median line are 16 in 
0,01 mm. as are also the marginal striw, except in the constrictions between the un- 
dulations, where they are only 12 in 0,01 mm. 
Length 0,07 mm. Breadth 0,035 mm. 
Pl. Il, fig. 19, 1°°/,. 
Gallapagos Islands (Eugenie Exp.). 
This variety has finer striae than the other forms of the most variable N. Hen- 
nedyi; the outline is also different. 
N. Hennedyi var. minuta Cu. 
Broadly oval, with the marginal punctate striae (7—8 in 0,01 mm.) separated 
from each other by unusually large spaces. Central striae 9—10 in 0,01 mm. 
Length 0,05 mm. Breadth 0,027 mm. 
Pl. L fig., 1h, 
Gallapagos Islands (Eugenie Exp.). 
