VEGA-EXPEBITIONENS YETENSKA.PLIG A ABBETEN. 



463 



5. Gomphonemeae. 



Bhoicosphenia curvata (Kiitz) Grun. (Gomphonema curvata 

 and G. marina W. Sm. Syn. 1, PI. XXIX, fig. 245—246) Greenl., 

 Bessel's Bay, Spitsb., Finm., Cape Deschnew (East Cape). 



Gomphonema hamtsehaticmn Grun. (Casp. S. Alg. pag. 12, 

 PL III, fig. 4. Van Heurck Syn. PI. XXV, fig. 29) Greenl, Bes- 

 sel's Bay (a small form, length 0,03 mm. br. 0,oo5 mm. Strise 15 

 in 0,01 mm. in the middle 18 in the end.) Mushroom Point. 

 Cape Waukarema (var. siberica Grun. in CI. M. Diat. 315 — 318, 

 more slender and linear; strise less radiant.) 



G. pachycladum Breb. (Van Heurck Syn. PI. XXV, fig. 31 — 

 32) Cape Wankarema. Strise parallel, 16 in 0,oi mm. Length 

 0,027 mm. Br. 0,oo6 mm. 



G. arcHcum Grun. (Van Heurck Syn. PI. XXV, fig. 30) F. 

 J. L., Novaya Zemlya (on the ice), Cape Wankarema. 



6. Naviculaceae. 



Navicula Bory. 



Sectio : Pinnularia. 



Navicula Pinnularia CI. (Ofvers. af K. Sr. Vet. Ak. Forh. 

 1868, pag. 224, PI. IV, fig. 1—2. N. quadratarea A. S. N. Sea 

 Diat. PI. II, fig. 26) Greenl., Mushroom Point, Spitsb., Finm., 

 Kara, Cape Wankarema. 



In the Cape Wankarema material occur a number of va- 

 rieties. The -valve valies from subconstricted to gibbous in 

 the middle with all possible transitions to N. Stuxbergii CI. 

 The strise are in some specimens from the same locality inter- 

 rupted and vary from 9 to 12 in 0,oi mm. var. interrupta CI. 

 PI. 36, fig. 21. 



Another variety, asymmetrica CI., has the strise on one half 

 of the valve more approximate to the median line, than on 

 the other. Length 0,o8. Br. 0,oi8, strise 8 in 0,oi mm. obscurely 

 punctate. 



N. Stuxbergii CI. (A. Diat. pag. 13, PI. I, fig. 15) F. J. L., 

 Kara, Cape Wankarema. 



var. subcontinua Grun. F. J. L. (unknown to me). 



var. leptostauron Grun. F. J. L. (unknown to me). 



N. fluminensis Grun. (Verb. 1860 pag. 520, PI. I, fig. 7) 

 Kara. 



