VEGA-EXPEDITIONENS VETENSKAPLIGA ARBETEN. 463 
5. .Gomphonemez2. 
Rhoicosphenia curvata (Kätz) Grun. (Gomphonema curvata 
ånd G. marina W. Sm. Syn. 1, P1. XXIX, fig. 245—246) Greenl., 
Bessel's Bay, Spitsb., Finm., Cape Deschnew (East Cape). 
Gomphonema kamtschaticum Grun. (Casp. S. Alg. pag. 12, 
P6]: 4£0- Man Heurek Syn: PI XXNyfeos 20)Greenl;i Bes- 
sel's Bay (a small form, length 0,03 mm. br. 0,005 mm. Strize 15 
in 0,01 mm. in the middle 18 in the end.) Mushroom Point. 
Cape Wankarema (var. siberica Grun. in Cl. M. Diat. 315—318, 
more slender and linear; striz less radiant.) 
G. pachycladwm Bréb. (Van Heurck Syn. Pl. XXV, fig. 31— 
32) Cape Wankarema. Strie parallel, 16 in 0j01 mm. Length 
0,027 mm. Br. 0,006 mm. 
G- arcticum Grun. (Van Heurck Syn. Pl. XXV, fig. 30) EF. 
J. L., Novaya Zemlya (on the ice), Cape Wankarema. 
6. MNaviculaceez. 
Navicula Bory. 
Sectio: Pinmmuaria. 
Navicula Pinmularia Cl. (Öfvers. af K. Sv. Vet. Ak. Förh. 
1868, pag. 224, PI: IV, fig. 1—2. N. quadratarea A.S. N. Sea 
Diat. P1. II, fig. 26) Greenl., Mushroom Point, Spitsb., Finm., 
Kara, Cape Wankarema. , 
In the Cape Wankarema material occur a number of va- 
rieties. The valve varies from subconstrieted to gibbous in 
the middle with all possible transitions to N. Stuxbergii OM. 
The strie are in some specimens from the same locality inter- 
rupted and vary from 9 to 12 in 0jo1 mm. var. interrupta OI. 
Pl136, mgs21 
Another variety, asynmmetrica Cl., has the strige on one half 
of the valve more approximate to the median line, than on 
the other. Length 0,8. Br. 0,018, strie 8 in 0,01 mm. obscurely 
punctate. 
NI Stuxbergar CEK(AL Diats pag. 13, Pl. I; fig: 15YERSTT:, 
Kara, Cape Wankarema. 
var. subecontinua Grun. F. J. L. (unknown to me). 
var. leptostawron Grun. F. J. L. (unknown to me). 
N. fluminensis Grun. (Verh. 1860 pag. 520, Pl. I, fig. 7) 
Kara. 
