VEGA-EXPEDITIONENS VETENSKAPLIGA ARBETEN. 47 
D. mimuta (Donk.) Ralfs (Donkin 1. ce. f. 8) Finm. 
Rhoicosigma arcticum Ol. (D. of the A. S. pag. 18, PI. III, 
fig. 16) Greenl., Finm., Spitsb., Kara (Matotschkin). 
Specimens from Hackluyts, Spitsbergen, have 21—22 strize 
in 0,01 mm. 
R. Reichhardii Grun. (M. J. 1877, pag. 181, P1. CXCV, fig. 
19) Kara, Cape: Wankarema. 
R. compachun (Grev.) Grun. (Pleuros. comp. Grev. M. J. 
Ni pag. 12, PIAILV) fig 9)yvKkara. 
"Ampläiprora (Plagiotropis) scaligera Grun. (A. D. pag. 66, 
BI Vigo 00) Einm. 
Al longa Cl (Diatos Al SS, pag. 20, PI; III, fig: 15) Fimm., 
Spitsb., Kara (Matotschkin). 
A. maxima var. dubia Cl. & Grun. (A. Diat. pag. 65, Pl. V, 
fig. 89) Finm. 
ÅA. plicata v. subplicata Grun. (A. Diat. pag. 65, PI. V, 
fig. 88) Kara, Cape Wankarema. 
A. (amphitropis) paludosa W. Sm. — Greenl. (Discovery Bay) 
Finm. 
var. Pokornyana Grun. (Verh. 1860, pag. 569, Pl. IV, fig. 
9) Kara. 
var.? hyperborea Grun. (A. Diat. pag. 62, Pl. V, fig. 86) 
Kara. 
var.? polaris Grun. Mpt. — F. J. L. 
var. punctulata Grun. (A. Diat. pag. 62, Pl. IV, fig. 84) 
Kara, Cape Wankarema. 
var.? borealis Grun. (1. ce. Pl. IV, fig. 85) Kara, Cape Wan- 
karema. i 
var.? duplex Donk. (Van Heurck Syn. P1. XXII, fig. 15—16) 
Greenl. (Discovery Bay), Spitsb. 
A. (Amphitropis) Kjellmani Ol. (A. Diat. pag. 15, Pl. IV, 
fig. 83). Kara, Cape Wankarema. 
ÅA. (Amplätropis) kryoplila Cl. — Large, median line strongly 
sigmoid. Junction-line between the keel and the carina wavy. 
Strie on the carina ending in small puncta, 13—17 in 0,01 
mm. closer than on the valve, 10—14 in 0,01 mm. Length 0,12 
—0,16 mm. Breadth of valve 0,017 mm. of frustle 0,0432—0,045 
mm., at the. constriction 0,02s—0,03 mm. — PI. 35, fig. 11. — 
Cape Wankarema. 
A. (Amplaitropis?) glacialis Cl. — Frustle almost linear, very 
little constricted in the middle; junction-line between the carina 
and the valve wavy. Strie on the keel 14 in 0,01 mm. more 
distant than on the valve, 19 in 0,01 mm. Pl. 35, fig. 12. 
