480 CLEVE, DIA TOMS: 
var.? Nyströmir Grun. (Cl. & M. Diat. No 172) Greenl. 
(Davis Strait), not known to me. 
Sectio : Spathulate. 
N. angularis W. Sm. (Van Heurck Syn. Pl. LXII, fig. 11— 
14) Greenl., Finm., Kara (Matotschkin), Cape Deschnew (East 
Cape). 
var. borealis Grun. (A. Diat. pag. 89, P1. V, fig. 99) Finm., Kara. 
var. kariana Grun. (1. ce. p: 89, fig. 100) Kara. 
N. spathulata Bréb. (Van Heurck Syn. Pl. LXII, fig. 7—8) 
Greenl. (Davis Strait), Finm. 
var. Ivalina Greg. (Van Heurck Syn. 1. c. f. 9) Kara. 
Sectio: Sigmoidee. 
N. macilenta Greg. — In the Diat. of the A. S. I have 
indicated this species as occurring near Spitsbergen, but, not 
having met this species again, I think it may be a mistake. 
N. Brebissonii var. borealis Grun. (Cl. & M. Diat. 316—318) 
Strie 14—16 in 0,01 mm. Cape Wankarema. 
Sectio: Sigmata. 
N. Sigma Sm. (Amphipleuwra rigida Cl. D. of the A. Sea pag. 
26. Ampbhipleura sigmoidea W. Sm.) Greenl., Finm., Spitsb. 
N. (Sigma var.?) scabra Cl. — Valve large, in length 0,17— 
0.2 mm. breadth 0,01 mm., slightly sigmoid, or almost straight. 
Keel eccentric. Puncta about 4 in 0,01 mm. Strie not seen, 
but the surface of the valve is covered by scattered puncta, 
which give it a shagreen-like appearance. — Pl. 38, fig. 13 
a. b — Cape Wankarema. 
N. levissima Grun. Mpt. — Greenl. (Discovery Bay), F. J. L, 
Cape Wankarema. 
Sectio: Obtuse. 
N. (obtusa var.??) kryophila Cl. Linear, slightly sigmoid 
toward the ends. Puncta 8, absent in the middle, where there 
is a small central nodule. Strie 20 in 0,01 mm., composed 
of puncta. Length 0,14 mm. Breadth.0,006 mm. — P1. 38, fig. 
74. — Cape Wankarema. 
Sectio: Lineares. 
N. gelida Cl. & Grun. Straight with cuneate ends. Keel 
tolerably eccentrie. Carinal puncta 6—58 in 0,01 mm., distant 
in the middle, where there is a distinet central nodule. Strix 
composed of somewhat elongate puncta, which form irregularly 
wavy lines, 20—24 in 0;j01 mm. Length 0714 mm. Breadth 
0,012 mm. — Pl. 38, fig. 70. — Cape Wankarema. A 
N. (recta var.?) polaris Grun. — Valve tolerably eccentric, 
linear with obtuse ends. Carinal puncta 7 in 0,or mm., distant 
